Smoke alarm with ionization smoke sensor. Features a silencer button which can hush detector for 3 minutes when it alarms from cooking. Safe and easy to test. Single button silence test. Locking features lock battery drawer and lock to base. 9 volt battery included. 30-day low battery signal. Easy access battery door, no need to remove alarm from ceiling to change the battery. Simple installation. 10-year limited warranty. UL listed.