First Alert 9120B Hardwired Smoke Alarm with Battery Backup, Pack of 6

Dual Ionization - Dual Ionization sensing chamber. Generally more effective at detecting small particles produced by flaming fires. Sources may include paper or kitchen grease Latching Alarm Indicator - Remembers which unit initiated an alarm Silence Feature - Silences nuisance alarms Two Locking Feature - Pins are provided to lock battery drawer and or alarm to base. Perfect for apartment, dormitory or hotel applications Approved for Use