12 best generic carbon monoxide alarms

Product description

Nest Protect is the smoke alarm that thinks, speaks, and alerts your phone. This smoke detector and carbon monoxide detector has a Split-Spectrum Sensor to detect fast-burning and smoldering fires, tests its own batteries, and lasts up to 10 years. It sends phone alerts when something’s wrong.[1] You can hush the alarm from your phone with App Silence. And it tells you when the batteries are running low, so there are no chirps at 2 AM.



[1] Mobile alerts require working internet and Wi-Fi.

• Designed in USA
• Smoke detector and carbon monoxide detector that speaks up in a friendly voice to give you an early warning when there’s smoke or CO in your home
• Split Spectrum Sensor looks for both fast burning and smoldering fires and tells you where the danger is
• Get phone alerts so you know something’s wrong even when you’re away from home[1]
• CO detector looks out for carbon monoxide and tells you where it’s located
• With App Silence, you can silence the smoke alarm with your phone in the Nest app when there’s only a little smoke
• No chirps to tell you the battery is low; Nest Protect tests its own batteries and gives you a Nightly Promise when you turn off the lights so you know everything is working

User questions & answers

Question:	Will these wired ones install on old electrical wired systems? The thermostat needed an additional wire installed. Will these, too
Answer:	Yes all the wired Nest Protect needs is the 120V hot (black) and neutral (white) wires in the electrical box connected to the plug-in pigtail that comes with the Protect. If your house has multiple detectors now you will usually also find a red wire in the electrical box that interconnects your old detectors so that if one goes off they all sound. That wire is no longer needed with the Protect so you just cap it with a wire nut.
Question:	Can you view carbon monoxide levels in PPM
Answer:	Yes, but only if you are connected to the internet and then only for the last ten days, and only if the level rises above the heads up level (which is 70ppm and rising for around an hour or a shorter period if over 150ppm). To counter what someone else's answer was - Carbon monoxide does NOT sink. It is in fact lighter than air (CO has an atomic weight of 28 versus Nitrogen (N2) which is also 28 - but marginally heavier (by 0.003 amu due to heavier isotopes), Oxygen (O2) which is 32 and Argon which is 40. However the weight is similar enough in the air in your house that it tends to distribute as a fluid and is measurable anywhere in a room; it really depends upon how air moves through the space. The levels tend to fluctuate rapidly as CO distributes and any outside air mixes in and additional CO is added. Overall, there is no perfect way to measure the CO levels with one device in one place, but this is as good as most people need.
Question:	What happens if the wifi disconnects? Does the alarm sound
Answer:	The Nest Protects and Nest Learning Thermostat create their own ad-hoc network and don't rely on your home wifi for communications between devices. WiFi is only used for communications OUTSIDE of the home to pass on alerts, etc. Even if the ad-hoc network fails the individual alarms will sound as they detect smoke/CO.
Question:	My home has hard-wired interconnected smoke detectors. can i simply replace one with this device? i read that it doesn't use interconnect wire
Answer:	I think very few here understand the question. National code requires interconnected smoke detectors as of 2004, there is an extra wire in the circuit and all smoke detectors are on that wire for 'signal'. When one alarms they should ALL alarm. If I am reading the answers correctly, NEST does not comply with the signal wire. However, it looks like it does set up its own wireless network to act like they are all interconnected. To be honest, after paying for the extra wire behind the wall, why would I want to by 6-8 nests at $100 each when the originals are 20-30 each? This way there is one smart point to notify if any detector is going off. Nests way 6-9 smoke detectors, 6-8 login, 6-8 ip address. Ugh, what a nightmare!

Product features

Thinks, speaks, and alerts your phone.

There’s never been a smoke and CO alarm quite like this. Nest Protect looks for fast-burning fires, smoldering fires, and carbon monoxide. It speaks up when there’s a problem and can send a message to your phone if you’re not at home.[1] And it helps keep you safe and sound for up to a decade.

Speaks up to tell you what’s wrong.

When there’s smoke or CO in your home, Nest Protect speaks in a friendly, human voice to give you an early warning and tell you where the danger is.

Silence with your phone.

With App Silence, you can hush the alarm on the Nest app if everything’s under control.

Nightly Promise.

The quick green glow means all your Nest Protects have tested themselves and the batteries are good.

Phone alerts.

Nest Protect can send you a message when there’s a problem or if the batteries are running low.[1]

Every second counts.

The Split-Spectrum Sensor detects smoke from both fast and slow burning fires.

10-year CO sensor.

Carbon monoxide is poisonous, but invisible. Nest Protect has long-lasting sensors to detect it.

Product description

The First Alert tamper resistant lithium battery powered smoke alarm provides a full 10 years of protection without having to change the batteries! Tamper resistant design eliminates removal of batteries for other uses and ensures operation over the life of the alarm. Mute feature silences nuisance alarms from cooking smoke or shower steam. This smoke and fire alarm includes power LED and alarm indicator, end of life signal and single test/silence button so you can test your alarm regularly. For maximum protection and the ultimate in assurance, you can depend on First Alert to secure what matters most in life. Includes a 10-year limited warranty.

From the Manufacturer

The First Alert tamper resistant lithium battery powered smoke alarm provides a full 10 years of protection without having to change the batteries! Tamper resistant design eliminates removal of batteries for other uses and ensures operation over the life of the alarm. Mute feature silences nuisance alarms from cooking smoke or shower steam. This smoke and fire alarm includes power LED and alarm indicator, end of life signal and single test/silence button so you can test your alarm regularly. For maximum protection and the ultimate in assurance, you can depend on First Alert to secure what matters most in life. Includes a 10-year limited warranty.

• Complies with all current 10-year legislation in U.S. states/cities where required
• Alarm features an ionization sensor for smoke detection, which is effective in recognizing smoke from flaming fires such as paper and grease fires
• Battery-operated unit provides continuous monitoring even if there's a power failure: plus, it's easy to install
• Alarm also features loud 85-decibel alarm, easy mounting bracket, a single test/silence button, and an end-of-life signal so you know when to replace the unit
• To ensure complete protection make sure to place one on each level of your home and in each bedroom.Same Features as SA340CN and SA340B but adds Sealed Battery Technology.
• First Alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 (Based on a First Alert Brand Trust Survey in February 2018)
• Complies with all current 10-year legislation in states/cities where required

User questions & answers

Question:	What is the dimension of the outside ring? I'm replacing old ones and want to cover the spot where the old one is
Answer:	Description says "UL217 Certified" but others here say it isn't. Sent the question to the seller.
Question:	Does this alarm warn for carbon monoxide too
Answer:	Photoelectric
Question:	I recently purchased three of these smoke alarms from Amazon. Can you tell me how high
Answer:	No, it is not. Also, there is no manufacturer or country of origin.
Question:	Is this detector a photoelectric or ionization type
Answer:	These appear to be manufactured by Heiman (model HM-626PHS) out of Guangdong, China. They are not UL rated, certifications include: EN14604 (UK), CE REACH BOSEC(Belgium). Hope this helps. https://www.amazon.co.uk/gp/product/B015R451B6/ref=s9_acsd_hps_bw_c_x_3_w

Product features

Smoke Alarms

Place at least 10 feet from kitchen/stove, and on the ceiling or high on a wall, no more than 10 inches from top.

Carbon Monoxide Alarms

Carbon monoxide alarms can be placed anywhere, not just the ceiling or high on a wall. They should be replaced every 5 to 7 years.

Fire Extinguishers

Keep in the kitchen and garage, but make sure to have the right grade for the type of fire that might occur.

Escape Ladders

Have at least one if your home has more than one story. Each room needs 2 escape routes; in most bedrooms it's the window, so have a ladder nearby.

Product description

1111111111.

From the Manufacturer

Carbon Monoxide Alarm AC Powered with Battery Back up; Tamper resistant feature; Led operation; Test reset button; Alerts user to replace after 10 years of operation; Low battery hush; Event memory; UL listed.

• Tamper resist feature – Can be activated to cause unit to go into alarm if it has been unplugged or has come loose from the outlet
• 2 LED’s: Red - Illuminates when in alarm mode. Green – AC power is present, normal operation
• Test/reset button: Tests CO alarm circuit operation and allows you to immediately silence the alarm
• End of life alarm: Alerts user to replace CO alarm after 10-years of operation
• Provides peace of mind against the silent killer; Temperature range: 40˚F (4.4˚C) to 100˚F (37.8˚C)

User questions & answers

Question:	When I unplug this device the green light goes off even though the batteries are installed as a backup. Is that normal
Answer:	It's about 5 1/2 in from hinge to hinge ~ 14.5 cm. It does provide full cover. The foam is flush with my face without being uncomfortable. It however is not waterproof. The foam has air slots so it can breathe. I've used these for Chemistry lab as well as wood working, and they work great.
Question:	When I try put battery in or plug it in, the alarm goes off! Does that alarm sound stop? It's brand new
Answer:	They stay on surprisingly well! I use them for my dog grooming business. They are light weight so that works good for me. They might be a bit too light for sports. If you got hit with a ball they would probably crack and potentially cut you.
Question:	How do you turn on the "low battery hush
Answer:	Yes, it should do a good job to keep out drywall dust. However, I ended up removing it due to condensation buildup while using it
Question:	What is the location of the wall plug on the device? Will it cover the entire outlet
Answer:	yes they can fit over Rx glasses but I don't recommend because they became blurring and you will not see very well

Product features

Quality Protection

The Kidde KN-COB-DP2 plug-in carbon monoxide alarm with battery backup provides you and your family with a warning signal to protect against dangerous levels of carbon monoxide in your home. The battery backup feature provides continuous monitoring of CO levels, even during power outages when AC-only units are not providing protection. The KN-COB-DP2 alarm has a 10-year product life, providing 40% longer protection than other CO alarms.

Protection You Can Trust

Nothing is more important than making sure your family is safe and prepared for anything, and with this plug-in carbon monoxide detector from Kidde, you will always be afforded peace of mind! This CO alarm includes a battery backup to make sure it is monitoring your home at all times and uses high-tech electrochemical sensors to provide accurate carbon monoxide readings that will always keep you protected.

Plug-in to Peace of Mind

To prevent nuisance alarms from everyday activities, CO detectors are time-weighted alarms that are based on time and the concentration of CO levels. This unit will only sound an alarm if low levels of CO have been detected over a long period of time, but high or unhealthy levels of CO will immediately trigger an alarm.

Product description

Kidde 21025778 Carbon Monoxide Alarm Battery. Made from quality materials for durability and performance. Designed for quick and simple installation.

• 2 AA battery backup
• Low battery hushes
• Event memory
• Loud 85 decibel alarm
• Low battery signal

User questions & answers

Question:	Would this device work in a 6' x 6' hunting blind with a Mr. Heater heating unit
Answer:	Not for sure but wife read that rhey can fluxiate between 0-3 with no problems mine does it also
Question:	your cob b lcm coc allarm is 15$ 6 is 99$ . why does quantity coct more
Answer:	When I used the digital gas detector to test it worked fine.
Question:	How far apart are the mounting holes
Answer:	There are two possible causes. The unit was not zeroed out upon activation or you do have a very low level of gas in your home atmosphere, with the first being my best guess. Unplug and move and re-check the reading. If this does not resolve the issue send it back for a new one. Mine has worked well for 6 months so far.
Question:	Why is the 2 pack more than 2 times the price of the single detector
Answer:	I returned these detectors. They don't have any information printed on the case - no manufacturer name, no instructions, no UL approved indicator, etc. These were made in China which is usually okay but I am not comfortable in relying on them to protect my family. I will be researching further and looking for better detectors that can be trusted.

Product features

Battery Operated Carbon Monoxide Alarm

The Kidde KN-COB-B-LPM Battery-Operated Carbon Monoxide Alarm is intended for continuous monitoring of carbon monoxide levels. The alarm features a piezoelectric horn that is rated at 85 dB at 10 ft. The alarm is battery operated for uninterrupted monitoring, even during power outages, and runs on 2 AA batteries, which are included.

Battery-operated carbon monoxide detector; no hardwiring required

Alarm will sound when dangerous levels of CO are detected

Test/reset button tests the unit for proper operation and resets the alarm

Product description

To minimize damage or injury in the event of a fire, the first step is having the right fire extinguisher on hand. The HOME1 Fire Extinguisher is ideal for use in any household location and is UL rated 1 A: 10 B:C for fighting wood, paper, trash, plastics, gasoline, oil, and electrical equipment fires. The commercial grade metal valve and trigger ensure it's ready to use in an emergency. Once used, it can be recharged by a certified professional. It also includes a mounting bracket to keep the unit secure and within reach and is U.S. Coast Guard–approved for marine use when used with the bracket.

From the Manufacturer

Multipurpose fire extinguisher features U. L. 1-A 10-B:C rated for wood, paper, trash and plastics fires. Also fights gasoline and oil fires as well as electrical equipment fires. Pressure gauge ensures the extinguisher is ready to use in an emergency with SureGrip Trigger. Meets U.S. Coast Guard standards for marine use.

• First alert's home1 fire extinguisher is UL rated 1 A: 10 B:C; it features durable all metal construction with a commercial grade metal valve and trigger
• Multipurpose fire extinguisher fights wood, paper, trash, plastics, gasoline, oil, and electrical equipment fires
• Use monoammonium phosphate extinguishing agent; Rechargeable by certified professionals after use
• Metal pull pin with a safety seal to help prevent accidental discharge and tampering; Corrosion resistant, easy to read, color coded metal gauge; Waterproof label with easy instructions
• U.S. coast guard approved for marine use
• First Alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 (Based on a First Alert brand trust survey in February 2018)

User questions & answers

Question:	Is this Co2 or dry chemical
Answer:	This mat can be hosed off but should not go through a washing machine.
Question:	Does this expire
Answer:	These mats are a nominal 3/8" thick (meaning they are slightly less than 3/8" but more than 1/4" thick). If you'd like a free cut sample of the actual material, just send your address to us at American Floor Mats and we'll be sure to get it right out to you. https://www.amazon.com/gp/offer-listing/B008BWFIBK/?seller=ASIRD3RM6OQ4 Thanks, American Floor Mats
Question:	It says the voltage is 120 volts. "voltage" what does that mean? Do you have to plug it in, or something
Answer:	These mats have a solid rubber backing and water/moisture will not drain through them. https://www.amazon.com/gp/offer-listing/B008BWFIBK/?seller=ASIRD3RM6OQ4 Thanks, American Floor Mats
Question:	What does " rechargeable" means ? Where can be recharged
Answer:	The Camel color is a lighter, more beige-like color whereas the Medium Brown is a bit richer, darker, earthtone color. If you'd like to see free color samples of these (or any other) colors, just send us a message with your address and we'll get the free color samples right out to you. https://www.amazon.com/gp/offer-listing/B008BWFIBK/?seller=ASIRD3RM6OQ4 Thanks, American Floor Mats

Product features

Smoke Alarms

Place at least 10 feet from kitchen/stove, and on the ceiling or high on a wall, no more than 10 inches from top.

Carbon Monoxide Alarms

Carbon monoxide alarms can be placed anywhere, not just the ceiling or high on a wall. They should be replaced every 5 to 7 years.

Fire Extinguishers

Keep in the kitchen and garage, but make sure to have the right grade for the type of fire that might occur.

Escape Ladders

Have at least one if your home has more than one story. Each room needs 2 escape routes; in most bedrooms it's the window, so have a ladder nearby.

Product description

This Protect Wired Smoke and Carbon Monoxide Detector from Nest is the ultimate smoke alarm for your home. Re-designed from the inside out, it has an industrial-grade smoke sensor, can be silenced from your phone, tests itself automatically and lasts for up to 10 years. Just like the original Nest Protect, it also tells you what's wrong so you know what to do and where to go and can even conveniently alert your phone in the event of an unforeseen event. Its super-efficient sensor detects both fast and slow burning fires.



Product Features:

Easily check the status in the Nest application

Emits a green glow when you turn off the lights

When you walk underneath it at night, path light will light your way

Can be easily and immediately silenced from your phone

Keeps your home safe and sound for up to 10 years

Sends alerts to your phone in case you aren't home

Split-spectrum sensor detects fast and slow burning fires

Detects the colorless and odorless carbon monoxide to keep your family safe in the event of leaks

A green glow when you turn off the lights means no low-battery chirps at 2 am

Easily detects the location and cause of the problem



Alarm Type: Carbon Monoxide,Smoke

Alarm/Detector Features: Hush Feature,Wi-Fi Enabled

Smart Home: Smart Home Enabled

Connector/Contact Type: 2-Wire

Voltage (volts): 1.5

Commercial / Residential: Residential

Power Source: Hardwired

Included: Batteries

Alarm Sensor Type: Dual-Sensor

Certifications and Listings: 1-UL Listed,CSA Listed





Product Depth (in.): 5.3

Product Height (in.): 1.5

Product Width (in.): 5.3

Storage Depth: 6.8X6.80X3

• Phone Alerts: Nest Protect sends you a message when there’s a problem or the batteries run low.
• Smoke and CO Locator: Nest Protect speaks up if there’s smoke or CO and tells you where it is, so you know what to do.
• Detects CO: Carbon monoxide is an invisible, poisonous gas. Nest Protect tells you where it’s hiding.
• A Light in the Dark: Usually Nest Protect has its light turned off, but when you walk underneath it, Pathlight can light your way.
• Fast Detection: Every second counts. The Split-Spectrum Sensor looks for both fast and slow burning fires.

User questions & answers

Question:	I have metal boxes in the ceiling for connecting to power. Does this unit connect to the standard metal power box and how are wires connected
Answer:	Yes. 3 slot is long enough
Question:	Will this mount to the socom
Answer:	It's M-lok. Or unsrew the base and catch the spring.
Question:	Is this 100% by springfield armory
Answer:	My rifle,is the new savage 110 precision.so I don’t need,but the bipod I throw way,already threw in trash.i lost my money.after use for short time,everything be came loose
Question:	Will this work with m1a qcb model
Answer:	Yes it does not a big sweep but it does move left and right
Question:	Will this fit with the shortened barrel of my socom 16 model M1A
Answer:	I believe it will with the legs fully extended. I run 20's with no issues.

Product description

Kidde 21026043 battery-operated (not hardwired) combination smoke/carbon monoxide alarm with voice warning KN-COSM-BA. Interconnects - No.

• Voice Alarm – Announces the hazard type detected thereby helping to speed up the correct reaction to the hazard detected. Alarm announces “Fire” when a smoke or fire hazard is detected and announces “Warning, Carbon Monoxide” when a CO hazard is detected
• Combined Carbon Monoxide and Smoke Alarm – A single unit can be installed where previously, two were needed. Reduces installation time and helps to keep home decor attractive.
• Audio alarm: 85 dB at 10 feet. Test/Reset Button and LEDs – Tests alarm circuitry and triggers the voice announcement. Flashing green for normal operation and flashing red for alarm condition. Humidity Range: 10 percent to 95 percent relative humidity non-condensing
• Battery - Provides protection even during power outages when many fire and carbon monoxide incidents occur. The unit warns of a low battery condition by announcing “low battery” and by initiating an alarm chirp and activating a flashing red LED. The battery door will not close unless the batteries are properly installed. Note: The date printed on the item is manufacturing date, not the expiration date. Refer to the PDF attached below in the technical specification for manual.
• Voice Announcements - Hush Feature temporarily silences nuisance alarms with “Hush Mode Activated” and “Hush Mode Cancelled” voice announcement. If the alarm had detected a CO level of 100 ppm or higher, the unit will announce “Carbon Monoxide Previously Detected” to warn of the CO incident, when the Test/ Reset button is pressed. Temperature range: 40˚F (4.4˚C) to 100˚F (37.8˚C). Voltage (volts): 4.5

User questions & answers

Question:	How frequently do we need to change the batteries
Answer:	They don’t connect or require wiring, place them wherever needed
Question:	Can this unit be used to replace the hard wired smoke detector in my home
Answer:	I received the energizer E522 max 9 V new batteries
Question:	Need to replace a kn-cosm-b. is the mount the same on the much newer kn-cosm-ba
Answer:	I don't understand your question. All batteries will burn if you put them in a fire.
Question:	Does the smoke detector have both photoelectric and ionization sensors
Answer:	Malaysia

Product features

Easy Access Front-loading Battery Door

Easily replace the 2 AA batteries without disconnecting from mounting bracket. This alarm model also includes a safety feature in the battery safeguard – The battery door will not close unless the batteries are properly installed.

Giving You Peace Of Mind

There’s nothing more important than keeping your family and home safe, and when fires are a very common type of emergency a homeowner can face, you want to be prepared. The Kidde KN-COSM-BA combination Fire Detector and Carbon Monoxide Detector pairs two life saving devices into one unit. It uses an ionization sensor and electrochemical sensor to monitor your home for potential hazards, so you will always feel safe and confident.

Comprehensive Alerts

Voice alarms along with chirps indicate the hazard that has been detected for fast response. Alarms include:

> Fire: The red LED will flash along with three long beeps, followed by the message “Fire!”

> Carbon Monoxide: Four short beeps followed by the message “Warning! Carbon Monoxide!”

Product description

The BRK SC9120B hardwire combination smoke and carbon monoxide alarm detects two hazards with one simple unit. Carbon monoxide (CO) is a colorless, odorless, deadly gas. It can be emitted by sources including gas or oil furnaces, gas clothes dryers, water heaters, fireplaces, wood stoves, charcoal grills, gas ranges, and space heaters. A clogged chimney, improper venting, and attached garages can also cause carbon monoxide accumulation. The BRK SC9120 hardwire combination smoke and CO alarm with battery backup includes these features: Quick plug in power connector for easy installation, 120 volt AC inter connectable (with maximum 18 compatible devices 12 other compatible smoke alarms + 6 compatible devices like bells, horns, repeaters and door closers. If one unit triggers an alarm, all smoke alarms in the series will sound. Single test/silence button which both silences a non-threatening alarm or low battery warning and allows you to test the unit's functionality. Automatically performs internal test of functionality. Latching alarm indicator which automatically identifies which unit initiated the alarm. Battery drawer lock and mounting bracket lock for tamper resistance. AC power indicator and alarm indicator light. Low battery warning "chirp" and missing battery tab. 9 volt battery backup for peace of mind during power outages. All BRK Electronics carbon monoxide alarms are listed to UL Safety Standard 2034 for residential carbon monoxide alarms. Includes 9 volt backup battery. 7 year limited warranty. Includes: One combination smoke and CO alarm, one 9 volt battery, and user’s manual.

• Keep your family safe with this hardwired smoke and carbon monoxide alarm; The battery backup means constant monitoring, even if there's a power failure
• Features an electrochemical carbon monoxide sensing technology as well as an ionization sensor for smoke detection.
• Indicator lights on the face of the unit display the presence of smoke or carbon monoxide, while an 85 decibel siren provides a clear, loud warning upon detection
• Can connect to other compatible BRK or First Alert detectors, to ensure all alarms will sound when threat is detected
• Simple to use, with a single test/silence button, and side load battery compartment; Tamper resistant locking brackets and universal mounting brackets make installation easy
• Rigorously tested to meet UL standards
• Faster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety
• First Alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 (Based on a First Alert Brand Trust Survey in February 2018)

User questions & answers

Question:	What is the manufacture date on these items
Answer:	Hello. Yes, but not the way you mean. When the alarms go off, there is always one alarm going off and setting off all of the others. This alarm will have a green light flashing every second as well as the red light. You have to identify that alarm and either put it in HUSH mode or unplug it and take it down to stop the others. This is intentional so that if you are not leaving the house then you are identifying and investigating where the smoke situation is and if there is danger. The HUSH mode will make the alarm require more smoke to go off and for a small amount of smoke will stop it for about 8 minutes If there is too much smoke, the HUSH mode will not stop the alarm for going off.
Question:	If the alarm goes off, how can you tell whether it's due to CO or fire if there is no voice alert
Answer:	Hello. Yes, this alarm comes with a wiring harness connector.
Question:	Because its a combo alarm where is the best place to install it since smoke rises and carbon monoxide doesn't
Answer:	Hello. The answer is no, the battery is only a temporary back up. If you want an alarm that is battery only, you will want our KN-COPE-D.
Question:	Why does this model contain the radioactive part? I am sure you are going to tell me that it is a trace amount and that it has all approvals
Answer:	Hello. When plugged in AC power, it is supposed to have a solid green LED light. When running on battery alone, it should have a green light that flickers every 60 seconds. If this is not what is happening, call us when you are on location with a ladder at 1-800-880-6788 so we can figure out what is going on and how we can resolve this.
Question:	When these are interconnected with other units, can hushing one of them hush all of them? Some of mine are in places that are hard to get to
Answer:	I paid FOR for 6 and only got 4. It’s listed as 6. I had to buy two more from Home Depot. DO NOT BUY THIS ITEM.
Question:	does it come with the hardwire connector
Answer:	Does not connect to hard wire. Only battery
Question:	Do you have to hardwire it in? Can it run on just the battery
Answer:	I just checked 2 of them, and am unable to locate that information.
Question:	How do you tell if it is working properly. Is it supposed to have a constant light
Answer:	The back cover comes off install battery and replace

Product features

Always Alert

In order to monitor your home even if you are away, this detector includes an Alarm Memory feature. If the green LED is blinking once every 16 seconds, the unit has detected CO levels of 100PPM or higher, or detected smoke and then ceased its alarm. Pressing the Test/Reset will reset the memory and inform you of the hazard detected.

Easy to Install

Ensure the safety of your family and home with the combination smoke and carbon monoxide alarm from Kidde. This is a hardwired alarm that can be used in an interconnected system, and it features a battery backup, in addition to voice alerts. Using an advanced photoelectric sensor, capable of detecting visible fire particles associated with smoldering fires, and an electrochemical sensor for CO detection, you can rest easy and feel protected.

Easy Access

If the low battery warning sounds, there is a convenient front-loading battery door so that you don’t have to remove the alarm from its mounting bracket to replace the alarm. Additionally, to ensure that there is always a properly functioning battery, the battery compartment will not close if the battery is not installed correctly.

Product description

Kidde Monoxide Alarm.

From the Manufacturer

The leading cause of accidental poisoning deaths in North America, Carbon Monoxide is odorless, tasteless and invisible. It is a silent killer. Kidde CO alarms include the most accurate sensing technology available, the patented Nighthawk electrochemical sensor. This unit combines a Carbon Monoxide and Ionization Smoke Alarm, providing two important safety devices in a single unit. This alarm includes a voice warning system that announces "Fire, Carbon Monoxide, Low Battery or Smart Hush Activation." The voice alarm eliminates any confusion and clearly warns you and your family of a smoke or carbon monoxide danger, or if your battery is in need of replacement. This unit is hardwired and will work with many interconnected systems. This combination alarm has battery backup, protecting you and your family even during a power outage when many incidences occur. Install at least one CO alarm on every floor and in sleeping areas. Make sure CO and Smoke alarms are at least 15 feet away from cooking or heating appliances to prevent false alarms. Replace CO alarms every 5 to 7 years to benefit from the latest technology upgrades. Ionization sensing alarms may detect invisible fire particles associated with fast flaming fires sooner than Photoelectric alarms. Studies show both types will effectively detect either type of fire. For optimal protection, install both smoke alarm technologies in your home.

• Smart Interconnect-Interconnects up to 24 Kidde devices (of which 18 can be initiating), Battery Backup (2-AA batteries included)-Provides protection during power outages. Front Loading Battery Door-Replace the backup batteries without disconnecting from mounting bracket
• Humidity range: 10%-95% relative humidity, non-condensing. Battery Lockout System-The battery door will not close unless the batteries are properly installed, Alarm Tamper Resist-Helps deter from tampering and theft, Adjustable Mounting Bracket-Makes installation fast and easy. Works with existing smoke and combination smoke and CO mounting brackets.
• Peak Level Memory-Announces “CARBON MONOXIDE PREVIOUSLY DETECTED” if alarm has detected a CO level of 100ppm or higher since it was last reset, HushTM Feature-Silences nuisance alarms for approximately 9 minutes. (Smoke must be present before HushTM is activated)
• Ionization Sensor Technology-Ideal for detecting fast flaming and other types of fires, est Button Functions: – Tests the unit for proper operation - Peak Level memory - Resets the Carbon Monoxide alarm
• Green LED-Illuminates to indicate the unit is receiving AC power. Flashes once every 60 seconds to indicate battery only mode. Flashes once per second during alarm to indicate initiating alarm. Flashes once every 16 seconds to indicate smoke or CO previously detected. Flashes every 2 seconds while the alarm is in HUSHTM mode
• Red LED-When a dangerous level of smoke or carbon monoxide is detected the red LED will flash. If the unit malfunctions, the red LED will flash and the unit will chirp every 30 seconds
• Talking alarm announces the hazard type detected, helping to speed up reaction time

Product features

Immediate Protection for Your Home

When fires are a very common type of emergency a family can face in their home, it’s important to do everything you can to be prepared. The Kidde KN-COSM-IBA interconnected combination smoke and CO alarm combines an ionization smoke sensor, which can detect smaller, less visible fire particles, with an electrochemical sensor, which detects CO, into a single, superior device. This interconnectable smoke and carbon monoxide detector provides constant, reliable protection to your home.

Install in Minutes

Complete with an adjustable mounting bracket, mounting hardware, a quick-connecting wire harness, two AA batteries and a user’s manual, this smoke and carbon monoxide alarm is easily set up in any room of your home for instant protection. It has a battery safeguard so it can’t accidentally be mounted without batteries. It meets the safety standards set by Underwriters Laboratories (UL) so that you can be confident of its quality.

Voice and Alarm Notifications

A verbal warning system reduces confusion and helps get occupants to safety.

Alarm warnings include:

> Fire: The red LED will flash with three long beeps, followed by the message “Fire! Fire!”

> Carbon Monoxide: Four short alarm beeps followed by the message “Warning! Carbon Monoxide!”

Alarms will repeat until hazard is cleared.

Product description

The Safe-T-Alert 35 Series Dual Propane/Carbon Monoxide Alarm with Flush Mounting detects both gas leaks and carbon monoxide gas simultaneously; Twelve volts power means no missing or dead batteries to replace and this alarm is built for extreme RV environments; This product meets RVIA/NFPA requirements and is listed to UL 1484 RV and UL 2034 RV; Available in white, brown, or black

• Double-duty alarm detects both gas leaks and CO gas simultaneously
• Reliable 12V power means no missing or dead batteries to replace
• Flush mount
• Meets RVIA/NFPA requirements and is listed to UL 1484 RV and UL 2034 RV
• Dimensions: 6.375" W x 2.875" H x 1.25" D

User questions & answers

Question:	What is the actual size? And what is the date manufactured
Answer:	6.5" X 3" X 1 3/8" deep. Mfg date on back of it is 1/7/2119. Front says "Replace by 60 Months After Retail Sale.
Question:	How do you know when this detector goes bad? Other than the production date on the back of it? Mine is dated May
Answer:	I had the same problem - Dated August 19, 2016. Not excited if I have to replace this every 3 years or so, I must say. But that's better then it going off in the middle of the night for no reason!
Question:	Can i mount in any direction
Answer:	Why would you want to Mount it on an angle or upside down I really do not think the factory does that I’ve never seen it before are you serious mounted where the other one was and beside it needs to be mounted close to the floor Propane weighs 1 1/2 times more than air that’s why it’s mounted as close to the floor as it can be
Question:	what voltage does low voltage indicator come on
Answer:	When it goes below 12V

Product description

The Kidde KN-COEG-3 AC powered, plug-in CO and explosive gas alarm protect you and your family from two deadly threats. The KN-COEG-3 includes 9V battery backup that provides protection during a power outage, when AC-only units cannot provide protection. By pressing the Peak Level Button you can see the peak CO level recorded by the alarm since it was last reset or unplugged. The continuous digital display shows you the level of carbon monoxide (if any) the unit is sensing as well as if gas is present. The gas sensor is a metal oxide sensor designed to detect natural gas (methane) or propane. Temperature range- 40 degree Fahrenheit to 100 degree Fahrenheit.

Protect your family from the dangers of carbon monoxide (CO), methane, and propane exposure with the Kidde KN-COEG-3 Nighthawk Plug-In Carbon Monoxide and Explosive Gas Alarm. The Nighthawk is an easy-to-install unit that provides reliable protection against the dangers of CO and explosive gas. The digital display shows if gas is present indicates CO levels in parts per million, allowing you to see if, how, and when levels change.

Advanced Technology in an Easy-to-Install, Plug-In Design

Designed for home use, the Kidde KN-COEG-3 Nighthawk is a UL-listed, A/C-powered, plug-in alarm that utilizes sophisticated electronic components and sensor technology to protect you and your family from the dangers of CO, methane, and propane exposure. It plugs directly into a standard A/C outlet and includes a 9-volt battery backup that provides continuous monitoring--even during power outages.

The Dangers of Carbon Monoxide, Methane, and Propane Exposure

The leading cause of accidental poisoning deaths in North America, carbon monoxide (CO) is often referred to as the silent killer because it's odorless, tasteless, and invisible. Carbon monoxide poisoning can come about via a number of sources, including everyday items and appliances in your home or office. And because symptoms of CO poisoning mimic the flu or other common illnesses it can often go undiagnosed.

Likewise, methane and propane gases are commonly used in homes for cooking, heating, and water heating. Although it happens rarely, gas leaks can sometimes occur inside the home, increasing the risk of fire or explosion.

Audible Alarm Pattern Alerts you to Elevated CO and Gas Levels

When placed on every level of your home, alarms like the KN-COEG-3 Nighthawk can help protect everyone in the house by giving you an unmistakable signal when gas levels have reached an unhealthy point. If unhealthy levels of CO are detected, the alarm will emit four quick audible beeps every five seconds until either levels decrease or the reset button is pressed. If methane gas or propane gas is detected, the alarm will emit beeps every other second with "GAS" shown in the display.

Easy-to-Read Digital Display Shows CO Levels

The KN-COEG-3 Nighthawk is preferred among traditional CO and explosive gas alarms because of its digital display. This display clearly shows levels of CO that the unit has detected and stored-- from 30 to 999 ppm--and it updates every 15 seconds to indicate any abrupt changes or alarming trends. The display also shows the peak CO level recorded by the alarm since it was last reset or unplugged. The continuous display also shows if gas is present.

LED Shows Sensor Status

With the KN-COEG-3 Nighthawk, you never have to wonder if the sensor is functioning properly. A blinking dot in the lower right-hand corner of the display denotes normal operation, so you can trust that it's working. In addition, you can test alarm function by pressing the test/reset button at any time to verify that the horn and electric circuitry are operating properly.

Convenient Mounting Options

The KN-COEG-3 Nighthawk has a low-profile design that makes it suitable for any room in your home. The detector can be plugged into any standard A/C outlet; it's plug can be snapped into the back of the unit and can be rotated so the alarm remains vertical, independent of whether the electrical socket is mounted vertically or horizontally. In addition, the alarm comes with a 6-foot extension cord, so the unit can be plugged into the wall outlet and then placed on a table or shelf. For the most thorough protection, place an alarm on every level of your home.

The UL-listed Kidde KN-COEG-3 Nighthawk has a seven-year life and is backed by a five-year limited warranty.

About Kidde: A UTC Fire and Security Brand

Renowned for global leadership in fire detection and suppression, Kidde provides solutions ranging from portable fire extinguishers to advanced industrial controls such as flame detection and explosion suppression systems. Kidde is a UTC Fire and Security brand, with a history that's rich with innovations, from the patent of the Chubb Detector Lock in 1818 to the development of the world's first wireless networked smoke detectors in 2004.

What's in the Box

Kidde KN-COEG-3 Nighthawk Carbon Monoxide and Explosive Gas Alarm, 9-volt battery, mounting hardware, and installation guide.

From the Manufacturer

The leading cause of accidental poisoning deaths in North America, Carbon Monoxide is odorless, tasteless and invisible. It is a silent killer. Kidde CO alarms include the most accurate sensing technology available, the patented Nighthawk electrochemical sensor. This unit is an AC powered, plug-in CO and explosive gas alarm that protects you and your family from two deadly threats. The 900-0113 includes 9V battery back up that provides protection during a power outage, when AC only units can not provide protection. By pressing the Peak Level Button you can see the peak CO level recorded by the alarm since it was last reset or unplugged. The continuous digital display shows you the level of carbon monoxide, if any. The unit is sensing as well as if gas is present. The gas sensor is a metal oxide sensor designed to detect natural gas , methane or propane. Install at least one CO alarm on every floor and in sleeping areas. Make sure CO alarms are at least 15 feet away from cooking or heating appliances to prevent false alarms. Replace CO alarms every 5 to 7 years to benefit from the latest technology upgrades.

• Protects you and your family from two deadly threats: Carbon monoxide and explosive gas.
• Sounder alarm – The KN-COEG-3 offers a loud 85-decibel pulsing alarm that will sound to alert you to a potential problem.
• Digital display - Displays the level of carbon monoxide the unit is sensing.
• Peak level memory - Recalls the highest CO concentration detected
• Test/reset button - Tests unit’s electronic circuitry operation and allows you to immediately silence the alarm
• Two alarms in one detects carbon monoxide and explosive gas
• Three convenient mounting options

User questions & answers

Question:	What is the sound level I need one for basement and need to hear on ground floor
Answer:	Dear cutomer, excuse that this prodcut Y301 can't detect hydrogen gas, it's mainly sensitive for methane and propane. thank you very much
Question:	is this an explosive gas and carbon monoxide detector? it only says "carbon monoxide detector" on the actual product
Answer:	Don't worry, it's normal, the large moisture change can affect the sensor performance, and may lead to false alarm, but the data on display only switch to 1,2 or 3, but won;t trigger the voice and light alarm. If the data become 5 or more than 5, voice and light alarm will be triggered. Thank you very much and best regards.
Question:	No manual included. Do I just plug it in and test it? What does it display if gas is detected? Thanks fellow Amazoners
Answer:	HI Niran, it's sensitive to methane and propane. We think it can't used to monitor and detect CO. thank you vey much
Question:	I smell natural gas in my house, and am wondering if that is the same as explosive gas? Will it detect natural gas
Answer:	Dear Karen, temporarily the Y301 doesn't get UL certification, it passed CE, FCC, EMC and RoHs. We are applying US ETL certification which is equivalent to UL certification. Thank you very much and best regards.

Product features

Plug-In Explosive Gas and Carbon Monoxide Detector with Battery Backup

The Kidde KN-COEG-3 AC powered, plug-in CO and explosive gas alarm protects you and your family from 2 deadly threats. The KN-COEG-3 includes 9-Volt battery back up that provides protection during a power outage, when AC-only units can not provide protection. By pressing the Peak Level Button you can see the peak CO level recorded by the alarm since it was last reset or unplugged. The continuous digital display shows you the level of carbon monoxide (if any) the unit is sensing as well as if gas is present. The gas sensor is a metal oxide sensor designed to detect natural gas (methane) or propane.

Carbon monoxide and gas detector plugs directly into wall outlet

Digital display updates CO level in PPM every 15 seconds

Loud 85 dBA pulsing alarm that will sound to alert you to a potential problem

Product description

The First Alert CO605 plug in carbon monoxide alarm with battery backup uses an electrochemical carbon monoxide sensor the most accurate technology available. The alarm easily plugs into any standard outlet with no additional mounting. Battery backup ensures alarm Works even during power outages. Mute button silences any nuisance alarms. Single button also tests alarm functions. Carbon monoxide alarm utilizes electrochemical sensor for increased accuracy. 7 year limited. Co alarm meets UL standards.

• Keep your family safe with this easy to use plug in carbon monoxide alarm; It works with any standard outlet and also has a battery backup for continuous monitoring of Carbon Monoxide levels, even if there's a power failure
• Features an advanced electrochemical carbon monoxide sensor that accurately detects carbon monoxide levels, no matter where the detector is placed in the room
• Simple to use, with a single test/silence button; A loud 85 decibel alarm sounds when carbon monoxide levels reach dangerous levels. Low battery signal mute, quiets low battery signal for up to 8 hours
• To ensure complete protection make sure to place one on each level of your home and in each bedroom
• 7 year limited warranty; Equipped with end of life signal chirp, so you know when it’s time to replace the unit for safety
• All first alert CO alarms are rigorously tested to meet UL standards. Item length is 3.4 inches, item width is 1.38 inches and item height is 5 inches
• First Alert has been the most trusted brand in home safety since launching the first residential smoke alarm in 1958 (Based on a First Alert Brand Trust Survey in February 2018)

User questions & answers

Question:	Does the monitor plug directly into the wall socket or is there an electric cord
Answer:	There is a tension knob.
Question:	Will the unit work without a bettery in it
Answer:	The longest disassembled piece is 50 inches, no problem storing in 6 foot compartment at least for length.
Question:	why does mine chirp intertmittently
Answer:	No it dont , I did look at it and no it dont , but you can move the power head into different angles to cut with
Question:	I love the idea of plug-in without messing with batteries at all, but plug-is are only a foot of the floor. gas is lighter than air. would we be dead by the time the house is so filled it reaches clear down to the outlet? now leaning toward battery unit so I can place it high. opinions
Answer:	No it does not swivel in the middle only on the handle side