BRK Battery-Powered Electrochemical Carbon Monoxide Detector

The 12 pack First Alert CO400 Carbon Monoxide Alarms utilizes a 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.