Smoke & Carbon Monoxide Alarm, Hardwired w/Battery Backup, Contractor 6-Pk.

6 pack, 120v ac/dc smoke & carbon monoxide alarm, contractor pack, easy installation/maintenance, include a large opening in the mounting bracket for easy access to wiring, key hole slots in the mounting bracket eliminate the need to remove the electrical box screws for installation, a battery pull tab keeps the battery fresh until the home is occupied, battery installation & removal can occur while the unit is mounted to the ceiling or wall via the side load battery compartment, 2 locking features are provided to prevent battery theft &/or theft of the unit, connection to ac power is made with a quick connect wiring harness, installation is quick, easy & cost effective, open stock TV# 210436,.