Front battery pull tab allows battery activation without removing alarm from mounting bracket|Large mounting base makes mounting easier, protects surface paint from dirt and covers imperfections|Pre-stripped wiring harness with easy off cap does not require stripper tool|Tinned strands increase conductivity and wire nut grip|One button design for easy operation and less confusion|Operates Hush and alarm test battery run down protection will shut down alarm memory when AC power is not present, reducing low battery chirp|Dust cover protects sensor from contaminates during construction reducing nuisance alarms|Tamper resist locking feature deters alarm theft|Alarm memory flashes red LED indicating which unit was the initiating alarm in interconnected system|Interconnects up to 24 devices (18 of which can be initiating) including smoke, carbon monoxide and heat alarms