The First Alert CO400 Carbon Monoxide Alarm utilizes an electrochemical carbon monoxide sensor that lasts for up to five years to detect carbon monoxide. This carbon monoxide detector is battery powered, making it portable and easy to use anywhere, even in the event of a power outage. When carbon monoxide levels become elevated, a loud 85-decibel alarm alerts you to the threat. When carbon monoxide levels rise, the carbon monoxide detector sounds an 85-decibel siren that is designed to wake even the soundest of sleepers. A low-battery light and alarm alert you when battery power is running low, and an end-of-life timer lets you know when the device should be replaced. A single button silences the alarm and tests the CO detector. A pull-down action chart instructs you of what to do if the CO alarm goes off.

Product Details
Power Source: Battery Operated
Battery Type: 9V
Sensor: Electrochemical
Simple and Easy to Use: Simply insert the battery, and the CO detector will start to monitor your space for carbon monoxide
Single Button: One press to silence and test alarm
End of Life Timer: Alarm chirps when it is time to replace it
Standards: UL 2034
Product Dimensions (LxWxH): 3.4 x 1.5 x 5 in.
Product Weight: .7 lbs.