Smoke Alarm with Escape Light, Battery-Operated

First alert 9v battery operated smoke alarm with escape light, 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 & testing the functionality of your alarm, ez access battery door removes the hassles & burdens associated with changing your alarm's batteries, further additions such as a theft prevention lock establish peace of mind & eliminate the thought of others tinkering with your alarm, meets ul217 standards, 10 year limited warranty.