Kidde Hardwired Smoke Alarm, 21007581

Kidde's i4618 is a hardwired smoke alarm with front load battery backup. Operates on 120V power source with 9V backup. Front battery pull tab allows battery activate without removing alarm from the mounting bracket. Large mounting plate makes mounting easier, protects surface paint from dirt and covers imperfections. Interconnectable up to 18 initiating devices (including smoke alarms, carbon monoxide alarms, combo CO/Smoke Alarms).