The Kidde i9010 is a 10-year, sealed battery operated smoke alarm featuring Hush™, Alarm Memory, and a self-activation mechanism that makes installation simple and easy. The alarm will automatically activate when it is attached to the mounting bracket; there are no pull-tabs, no switches--everything is automatic. The sealed-in board-mounted battery will power the i9010 unit for its complete 10-year life. No replacement battery will ever be needed, and an End of Life alert indicates when it is time to replace the alarm.