Universal Security Instruments Battery-Operated Ionization Smoke & Fire Alarm, Model 976LR 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 Comes with a 10 year limited warranty