Escape light smoke alarm comes equipped with a bright light to illuminate a clear path to assist owners in their escape. Utilizing an ionization smoke sensor, this alarm performs exceptionally well in detecting smoke brought on by flaming fires. A mute button has been included to serve the dual purpose of silencing nuisance alarms and testing the functionality of your alarm. Includes (1) 9-volt battery. Battery life varies according to use and application. 10-year limited warranty. UL (Underwriter's Laboratories) listed.