First Alert 10-year ionization smoke alarm ideal for detecting fast flaming fires. Features 10-year alarm life with sealed lithium battery which eliminates replacing batteries. Includes a test/silence button and a tamper resistant design. Power LED (light emitting diode) and alarm indicator. End of life warning notifies when the alarm needs to be replaced. Legislation and code compliant. Ideal for rental properties. Easy installation, includes twist mount and hardware.