First Alert 0827B Sealed Battery Smoke Alarm, 3 VHighlights: Ionization sensor helps detect fast flaming fires Tamperproof, sealed alarm design, constant protection since battery cannot be removed Meets code for sealed tamperproof alarms, ideal for rental properties Mute button mutes unnecessary alarms immediately and also tests alarm function Easy installation, includes easy twist mount and hardware Power led and alarm indicator End of life signal alerts you when alarm needs to be replaced
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