Ionization Smoke and Fire Alarm responds quickly to fast flaming fires to protect your family against deadly threats in the home. 120-volt AC hardwired alarm with backup battery is suitable for houses, apartments and mobile homes. Fully interconnectable with all USI and Universal 120V alarms using existing wiring and mounting. Features a quick activation pull-tab and a front-loading battery drawer for replacement without removing the alarm from the bracket. With silence button. White.