First Alert Hardwired Smoke Alarm with Battery Backup 4 PACK

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 Detector Orientation: Wall/Ceiling Mounted Power Source(s): Battery Mounting: Wall 9 Volt battery back up 120 Volts 4 PACK Single button for testing and silencing Latching alarm indicator, identifies which unit initiated an alarm Perfect mount allows for easy installation Meets new construction requirementsYou may also like First Alert Smoke Alarm SA350B Lithium Battery Ionization Smoke Alarm 10-Year Sealed Tamper-Proof Battery [ 2 PACK ]- 0827-SA340CN SA340CN.