Smoke Alarm Battery Location Sealed Battery Locking Pin Yes Battery Size Not Applicable Detector Type Smoke Detector Features Patented Quick Find Alarm Origination Feature easily identifies the first alarm to sound in an interconnected system. Single Test/Silence Button. Easy Installation and Fewer Callbacks. 10 Year Product End-of-Service Warning. Tamper Resistant Alarm Battery. Meets UL NFPA FHA HUD and California State Fire Marshal Standards Includes Dust Cover