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First Alert CO605B Plug In Carbon Monoxide Alarm with Battery Backup
First Alert CO605B Plug In Carbon Monoxide Alarm with Battery Backup


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Offering a high level of functionality, reliability and flexibility, the plug-in First Alert CO605B Carbon Monoxide Alarm w/ Battery Backup allows you to conveniently monitor the level of CO gas in your living areas. This unit plugs into any standard outlet, and is backed up by a dependable battery that ensures that even if the power goes out, you will know if you need to worry about carbon monoxide levels.

The First Alert CO605B is also portable, which means that you can move it to any room in your home quickly and easily, as you see fit. This unit features a highly accurate electrochemical CO sensor, as well as a convenient single button for testing and silencing. It also has a front-access compartment for the battery, and is compatible with BRK.

In addition, the First Alert CO605B CO Alarm is UL listed and comes standard with a five-year warranty direct from the manufacturer. It works well within a temperature range of 40 to 100 degrees F and a humidity range of 10 percent to 90 percent relative humidity.


7-Years Limited Warranty

Model # CO605B

Weight 6.6 oz

Dimension 3.3"H x 4.8"L x 2.1"D

Operating Voltage 120V AC 60 Hz

9V Alkaline Battery Backup

Temperature Range 40°F (4°C) to 100°F (38°C)

Humidity Range 10% to 95% relative humidity (RH)

Audio Alarm 85dB at 10 feet

Test/Silence Electronically simulates CO conditions, causing the unit to alarm or temporarily silence the alarm

Alarm Reset Automatic when carbon monoxide clears

CO Sensor Electrochemical

Indicator Lights/Sounds

AC Power: Constant red light

DC Power: Intermittent red light

Audio Alarm (4 beeps, pause, 4 beeps), rapidly flashing red light

Listing Listed to UL 2034 Standard

Average Rating: Average Rating: 5 of 5 5 of 5 Total Reviews: 2 Write a review »

  0 of 0 people found the following review helpful:
5 of 5 February 11, 2020
Reviewer: Linda Kuhlwein from Green Cove Springs, FL United States  

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  0 of 0 people found the following review helpful:
5 of 5 Better than battery alone November 30, 2016
Reviewer: Whitney L Bruno from Columbus, OH United States  
Used to have one of these that worked on battery alone. Was fine, but needed to remember to change battery. This uses its battery as a back up only. Does take up whole plug+

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