Kidde Worry Free 10-Year Living Area Sealed Lithium Battery Operated Smoke Alarm Kidde Worry Free Lithium-ion battery operated smoke alarms are powered by a sealed, long-life lithium battery for ten years (the life of the alarm), meaning the alarm is always on. This Smoke Alarm is ideal for the living areas. With a sealed, long-life Lithium Battery Smoke Alarm, you can enjoy peace of mind knowing your living area Smoke Alarm is always on; 24 hours/day, seven days a week for a decade. End-of-life signal alerts you that it is time to replace the smoke alarm 10 year living area smoke alarm is maintenance-free; never replace a battery during the alarm's operating life, in addition to the benefit of maintenance free, batteries are sealed, no need to worry about them being removed Ideal for living areas in the home Alarm is equipped with test/reset button Powered by a 10 Year Lithium Battery Unit activates when installed properly with bracket(included) UL/CSFM Ref. Kidde Part P3010L Connector/Contact Type: None Voltage (volts): 3 Alarm/Detector Features: 10-Year Battery,Hush Feature,Tamper Resistant Alarm Type: Smoke Commercial / Residential: Commercial / Residential Pack Size: 1 Included: Batteries Power Source: Battery Alarm Sensor Type: Photoelectric Certifications and Listings: 1-UL Listed Product Height (in.): 5.6 Product Depth (in.): 1.55 Product Width (in.): 5.6 Item Condition: Definitely Brand New but original packaging is slightly damaged. FREE Shipping!!!