First Alert Hardwired Smoke Alarm with Battery Backup, 12 Pack U51630

Smoke alarm Single button for testing and silencing Smoke detection technologies Latching alarm indicator, identifies which unit initiated an alarm Perfect mount allows for easy installation Meets new construction requirements Product Type: Smoke DetectorOrientation: Wall/Ceiling MountedPower Source(s): BatteryMounting: Wall 9 Volt battery back up120 Volts Model: 9120B 12 PACK Single button for testing and silencing|Smoke detection technologies|Latching alarm indicator, identifies which unit initiated an alarm|Perfect mount allows for easy installation|Meets new construction requirements