Features The Kidde AC/DC carbon monoxide alarm plugs directly into your home's standard wall outlet making installation quick and easy The 2 AA battery backup provides protection even during power outages when many CO incidences occur This alarm uses advanced electrochemical sensing technology to monitor for carbon monoxide levels in your home Tamper Resist Feature unit alerts you if it has been unplugged or has come loose from the outlet LED Operation Green LED-AC power is present, normal operation Red LED-illuminates when in alarm mode. Tes/Reset Button 2AA Battery Back up Low Battery Hush Loud 85 Decibel Alarm UL Listed Specifications Type: Carbon Monoxide