Kidde i12060 Hardwire with Front Load Battery Backup Smoke Alarm Easy Installation - 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 Fewer Callbacks - Front battery door makes replacing the battery easy for anyone. 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 User-Friendly Features - Tamper resist locking feature deters alarm theft. Alarm memory flashes red LED indicating which unit was the initiating alarm in interconnected system. Battery backup provides protection in case of power failure Interconnectable - Connect up to 24 devices (of which 18 can be initiating) including smoke, CO and heat alarms. See users guide for complete instructions Front-loading battery door allows you to change the battery without removing the alarm from mounting bracket