Plug & protect, alarm plugs into any standard 120v ac outlet with no additional mounting;Mute button silences unnecessary alarms. It also tests the alarm's 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;1 9v battery included;Loud 85db alarm;7 Year Limited Warranty, carbon monoxide alarms should be replaced every 5 years for maximum protection;Meets UL2034 standard;Emits T3 Pattern;Product Dimensions (LxWxH)- 3.4 x 1.38 x 5 in;Product Weight- 1.1 lbs