[HEAVILY USED] First Alert 10-Year Battery Smoke Alarm

This First Alert SM210 smoke alarm features a slim profile and First Alert's Precision Detection advanced sensing technology, complying with new industry standards to reduce nuisance alarms while providing early fire detection. The 10-year sealed battery eliminates the need for replacements and prevents low battery chirps for the life of the alarm. An end-of-life warning indicates when replacement is needed, and a test/silence button allows for efficient testing.