Kidde 2101016 Worry-Free Sealed Lithium Bedroom Smoke Alarm W/ Voice Alarm (Dc)

This Kidde Worry-Free Bedroom Smoke Alarm is equipped with a ten-year sealed lithium battery, photoelectric sensing technology, and a Smart Hush feature. When smoke or fire is detected, the 85 dB alarm and voice warning feature (that announces “Fire! Fire!”) combine for a more effective alert during sleep. Alarm is fully automatic and activates when attached to mounting bracket. There are never any batteries to buy or replace. And at the end of its alarm life it chirps, letting users know it needs replacing.