First Alert(R) General-Use Smoke Alarm

First Alert detectors sound loud, 85 decibel alarms to alert you of smoke buildup which could be due to fire. Safety warning signal lets you know when batteries (included) need replacing before they lose effectiveness. Attach easily to walls or ceilings! Detector features a flashing LED that indicates detector is working and a hinged safety cover for easy battery replacement. Backed by the manufacturers 10-year limited warranty.