DESC: The Carbon Monoxide sensor provides early warning of dangerous carbon monoxide gas levels. A pre-alarm warning feature indicates low levels of CO, and a built-in Learn Mode transmitter reports information to the Control Panel. The detector plugs into an AC power outlet and will operate for four hours without AC power using its internal rechargeable battery. Features Test/reset button Internal siren signals when CO is present Typical transmitter battery life is 3-5 years Specifications Color: White Dimensions: 6.5" wide, 3.5" high, 2.25" deep Installation: plugs into wall socket Compatibility: Simon and the Quik Bridge Loop Receiver