First Alert 10-Year Tamper Resistant Smoke Alarm, 0827B

This First Alert 0827B 10-Year Sealed Tamper Resistant Ionization Smoke Alarm features a long-life 3V lithium battery that effectively provides a full 10 years of protection, without requiring any battery change. A single test/silence button lets you quickly mute nuisance alarms from cooking smoke or shower steam. This smoke and fire alarm also includes an easy mounting bracket and alarm end-of-life indicator.