Smoke alarm Front battery pull tab allows battery activation without removing alarm from mounting bracket Prestripped wiring harness with easy off cap does not require stripper tools Tinned strands increase conductivity and wire nut grip Large mounting base makes mounting easier, protects surface paint from dirt and covers imperfections Large centrally located alarm control button Dust cover protects sensor from contaminates during construction reducing nuisance alarms Battery backup provides protection in case of power failure 120 V power source with 9 V battery backup