Kidde 21009663 10-Year Worry Free Battery Operated Smoke Alarm

Kidde battery operated smoke alarm is powered by sealed, long-life lithium batteries for ten years (the life of the alarm), meaning the alarm is always on. This smoke alarm is ideal for the living area. 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 per day, seven days a week for a decade. Kidde 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. 10-Year worry free battery operated smoke alarm (3-pack) is powered by sealed, long-life lithium batteries for ten years.