First Alert Hardwire Smoke Alarm, Dual Sensor | SM300, AA Battery Backup Brand: First Alert Color: White Features: First Alert's Precision Detection advanced sensing technology reduces cooking nuisance alarms and delivers early warning Dual smoke sensor technology provides optimal protection for both smoldering and fast-flaming fires Interconnects with most First Alert and BRK alarms so when one sounds, all compatible alarms sound to provide an early warning The latching alarm indicator visually identifies the unit that initiated the alarm or low battery warning. Battery backup provides continuous protection during power outages. The test/silence button allows for efficient testing and temporarily silences alarm for up to 8 hours Binding: Tools & Home Improvement Model Number: FSM300AC1PK Part Number: FSM300AC1PK Details: First Alert SM300-AC, Interconnect Hardwire Dual Sensor Smoke Alarm with Battery Backup, 1-Pack EAN: 0194160015810 Package Dimensions: 9.9 x 7.3 x 3.8 inches