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Best carbon monoxide detectors - October 2026

Last Updated - October 21, 2026

1
Best Choice

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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Kidde

Kidde Carbon Monoxide Detector, Plug-in Carbon Monoxide Detector with AA Battery Backup, 85 dB Alarm, LED Status Light Indicators, 3rd Edition

Kidde

(6% Off)

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Main highlights
- Test-Hush Button makes testing the detector or silencing false alarms easy
- Peak Level Memory records the last time carbon monoxide was detected or when the unit was last tested
- Easy Installation - simply plug-in to a standard, 120V outlet in your home
- 85-decibel alarm announces when carbon monoxide is detected
- 2-AA battery backup provides protection during a power outage
(6% Off)
2
Best Value

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Kidde

Kidde Carbon Monoxide Detector, AA Battery Powered CO Alarm with LEDs, Test-Reset Button, Low Battery Indicator, Portable

Kidde

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Main highlights
- UL listed with a 10-Year limited manufacturer warranty on the alarm only (not a battery performance claim). Warranty begins when the alarm is powered on. If that date is unknown, it should be assumed that replacement is needed.
- Test-Hush button makes it easy to test the carbon monoxide detector or temporarily silence the low battery chirp warning
- Peak Level Memory records the last time carbon monoxide was detected or when the unit was last tested
- Green LED indicates power to the smoke detector, while an 85-decibel alarm & a red LED indicates the presence of carbon monoxide
- Electrochemical sensor technology detects CO gas
- Easy installation, no wiring needed, detects during a power failure by operating on 2-AA batteries (included)
- Conveniently designed & portable: simple to install on a wall of your home or place on a tabletop
3

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Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

First Alert

First Alert Battery Carbon Monoxide Alarm | CO400

First Alert

More Details
Main highlights
- To ensure complete protection make sure to place one on each level of your home and in each bedroom
- Keep your family safe with this easy to use, battery operated carbon monoxide alarm; Battery powered alarms provide continuous monitoring of CO levels, even if there's a power failure
- 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)
- Features an advanced electrochemical carbon monoxide sensor that accurately detects carbon monoxide levels, no matter where the detector is placed in the room.The alarm sequence should last 5-6 seconds. If it does not alarm, make sure fresh batteries are correctly installed, and test it again. If the unit still does not alarm, replace it immediately
- All first alert CO alarms are rigorously tested to meet UL standards
- A loud 85 decibel alarm sounds when CO levels reach dangerous , Battery Replaceable - Yes
- 5-year limited warranty; Equipped with end of life signal chirp, so you know when it’s time to replace the unit for safety
4

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

Kidde

Kidde Carbon Monoxide Detector, AA Battery-Powered, COB | LED Status Lights, Loud 85 db Alarm, Lightweight and Portable for Travel or Home, 5th Edition

Kidde

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Main highlights
- TRAVEL-READY DESIGN*: Compact carbon monoxide detector is suitable for use at home or for travel; lightweight design allows you to take it on the go to use in hotels or vacation rentals when detection is needed away from home
- TESTED & TRUSTED: This carbon monoxide alarm is rigorously tested to meet UL 2034 5th Edition standards, and is ETL Listed; includes a 10-year limited warranty on alarm
- DETECTS CARBON MONOXIDE: Model COB monitors CO and sounds a loud 85 dB alarm to signal evacuation to fresh air; LED warning light indicates hazard; Test/Hush button allows quick checks or temporary silencing
- BUILT FOR EVERY HOUSEHOLD: Designed to help provide dependable carbon monoxide monitoring for everyday residential use; supports renters, homeowners, and pet owners seeking added awareness and protection from CO hazards in the home
- AA BATTERY POWERED: This CO detector is battery-powered, installs without wiring, mount it on the wall or set it on a table, and operates during outages using two included AA batteries
5

✖
Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

First Alert

First Alert Battery Carbon Monoxide Alarm | CO400

First Alert

More Details
Main highlights
- To ensure complete protection make sure to place one on each level of your home and in each bedroom
- Keep your family safe with this 2-pack of easy to use, battery operated carbon monoxide alarms; Battery powered alarms provide continuous monitoring of CO 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
- All first alert CO alarms are rigorously tested to meet UL standards
- A loud 85-decibel alarm sounds when CO levels reach dangerous levels
- 5-year limited warranty; Equipped with end-of-life signal chirp, so you know when it’s time to replace the unit for safety

Best carbon monoxide detectors - October 2026

Kidde Carbon Monoxide Detector, Plug-in Carbon Monoxide Detector with AA Battery Backup, 85 dB Alarm, LED Status Light Indicators, 3rd Edition

Kidde Carbon Monoxide Detector, AA Battery Powered CO Alarm with LEDs, Test-Reset Button, Low Battery Indicator, Portable

First Alert Battery Carbon Monoxide Alarm | CO400

Kidde Carbon Monoxide Detector, AA Battery-Powered, COB | LED Status Lights, Loud 85 db Alarm, Lightweight and Portable for Travel or Home, 5th Edition

First Alert Battery Carbon Monoxide Alarm | CO400

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