First Alert SM210, 10-Year Sealed Battery Smoke Alarm with Slim Profile Design, 1-Pack

First Alert's Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency., 10-Year sealed battery eliminates battery replacements and low battery chirps for the life of the alarm, Slim profile design is half the depth of a standard alarm, End-of-life warning lets you know when it’s time to replace the alarm, Test/silence button for efficient testing to ensure alarm is working properly