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Best carbon monoxide detectors - August 2026

Last Updated - August 22, 2026

1
Best Choice
21% Off

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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
21% Off

Kidde Carbon Monoxide Detector, AA Battery Powered, Portable for Travel or Home, 85 dB Alarm, LED Status Indicators, 3rd Edition

Kidde

(21% Off)

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Main highlights
- Green LED indicates power to the carbon monoxide detector, while an 85-decibel alarm & a red LED indicates the presence of carbon monoxide
- Event Memory records the last time carbon monoxide was detected or when the unit was last tested
- Electrochemical sensor technology detects CO gas
- Easy installation, no wiring needed, detects during a power failure by operating on 2-AA batteries (included); Install on a wall of your home or place on a tabletop
(21% Off)
2

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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 Plug-in Carbon Monoxide Alarm

First Alert

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Main highlights
- To ensure complete protection make sure to place one on each level of your home and in each bedroom
- 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 upto 8 hours
- Loud 85-decibel alarm sounds when CO levels are elevated
- 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
- 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
- 7 year limited warranty; Equipped with end of life signal chirp, so you know when it’s time to replace the unit for safety
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 CO400 Carbon Monoxide (CO) Detector, Battery Operated Alarm, 2-Pack

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
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, Plug-in & AA Battery Backup, COP

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
- PLUG-IN POWER WITH BATTERY BACKUP: CO detector plug-in operates on 120V AC with 2 AA backup batteries (included) for detection during outages; rotating plug fits vertical or horizontal outlets; includes power surge immunity to help maintain performance
- DETECTS CARBON MONOXIDE: Model COP monitors CO levels & sounds a loud 85 dB alarm to signal evacuation; sleep peacefully with no nighttime chirps; LED warning light indicates hazard; Test/Hush button for quick checks
- 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
5
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, Plug-In with 9V Battery Backup, Digital Display, 85 dB Alarm, LED Status Light Indicators, 3rd Edition

Kidde

(5% Off)

More Details
Main highlights
- 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
- Digital LED display shows the level of carbon monoxide the CO alarm is sensing
- 9-volt battery backup provides protection during a power outage
- 85-decibel alarm announces when carbon monoxide is detected
(5% Off)

Best carbon monoxide detectors - August 2026

Kidde Carbon Monoxide Detector, AA Battery Powered, Portable for Travel or Home, 85 dB Alarm, LED Status Indicators, 3rd Edition

First Alert Plug-in Carbon Monoxide Alarm

First Alert CO400 Carbon Monoxide (CO) Detector, Battery Operated Alarm, 2-Pack

Kidde Carbon Monoxide Detector, Plug-in & AA Battery Backup, COP

Kidde Carbon Monoxide Detector, Plug-In with 9V Battery Backup, Digital Display, 85 dB Alarm, LED Status Light Indicators, 3rd Edition

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First Alert CO400 Carbon Monoxide (CO) Detector, Battery Operated Alarm, 1-Pack

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

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