i4618 4-Pack Hardwired Smoke Alarm with Ionization Sensor, 120V AC, 9V Battery Backup

The Kidde i4618 Smoke Alarm is compatible with Kidde, FireX, Code One, and Sentinel products. It operates on a 120V AC power source with a 9V battery backup. The contractor box includes 4 alarms, mounting brackets, batteries, and wire harnesses.