Kidde Smoke Detector, Hardwired with Battery Backup & Interconnect, Battery Included

One button design allows you to test the smoke detector or temporarily silence a nuisance alarm with the Hush feature
Smoke alarm still works during a power failure – unit operates on a 120V power source with 9V battery backup (battery included)
Easy installation – smoke detector includes a quick connect power harness
Interconnectable with other hardwired alarms, providing whole-home alarm activation – when one detects smoke, they all sound, alerting everyone in the house