Check the listing for details. BRK Hard-Wired w/Battery Back-up Ionization Smoke Detector 6-Pack. Condition: New. Listed at 129.95 USD. BRK Hard-Wired w/Battery Back-up Ionization Smoke Detector 6-Pack The First Alert SMI100-AC Hardwire Interconnect Smoke Alarm with Battery Backup meets new industry standards by utilizing First Alert's Precision Detection advanced sensing technology. This hardwire smoke alarm is easy to install and replace existing alarms with no need to rewire. Plus interconnect compatible alarms to create a whole home alarm system to help provide an early warning.First Alert's Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergencyThrough early warning interconnect, when one alarm sounds, all compatible alarms will soundBattery backup provides continuous protection during power outagesAlarm indicator visually identifies the unit that initiated the alarmQuick Connect Plug included allows for easy installation with no need to rewire Specifications:Brand Name: BRKPower Type: Hard-Wired w/Battery Back-upSensor Type: IonizationProduct Type: Smoke DetectorNumber in Package: 6 pkPackaging Type: BoxedTest and or Reset Button: YesWarranty: 10 year