Plug-in carbon monoxide alarm with battery backup easily plugs into any standard outlet with no additional mounting necessary, Battery backup ensures alarm works even during power outages, Mute button silences any nuisance alarms, Single button also tests alarm functions, Carbon monoxide alarm utilizes electrochemical sensor for increased accuracy, CO alarm meets UL standards, This carbon monoxide alarm is for you if:, You want the convenience of simply plugging in your alarm, but also want the added protection of battery backup in case of power outage, Where To Place Carbon Monoxide Alarms: One on every level of the home and one in each sleeping area, Plug and protect, alarm plugs into any standard 120v ac outlet with no additional mounting, Mute button, mutes unnecessary alarms, also tests alarm function with same button, EZ access battery door, front-open compartment allows easy battery change without dismounting alarm, Low battery signal mute, quiets low battery signal for up to 8 hours, Electrochemical sensor, most accurate technology available for detecting carbon monoxide* *compared to other common sensing technologies, End of life timer, alarm chirps when it is time to replace it, 2 AA batteries included, Loud 85db alarm, Meets UL2034 standard, SKU: EACS257