Kidde Firex Smoke Detector, Hardwired with nine-V Battery Backup & Front-Load Battery Door, Smoke Alarm, 4-Pack

The Firex Smoke Detector, Smoke Alarm, 4-Pack uses a 120-V power source with a nine-V alkaline battery backup so your home is always protected. This detector will warn you of fire particles, even if the power is out. The green LED lets you know it's receiving power and the red LED flashes for standby, if the alarm senses smoke, fire, combustion, hush mode and alarm memory if it is activated. They are UL certified with a 10-year limited warranty and meets requirements of UL217, NFPA72, The State of California Fire Marshall, NFPA 101, FHA and HUD.Shop all Kidde fire safety products hereExplore Kidde curated fire safety kits; all products to protect your home from fire in one packageHardwired 120-V power source with a nine-V battery back-upTest/reset button - tests the smoke alarm circuitry and resets memory after an alarm has soundedNo low battery chirps; internal timer alerts you to replace the entire unit after 10 years85 decibel fire alarm alerts of fireIonization sensor - detects invisible fire particles...