The First Alert SM100V-AC Interconnect Hardwire Smoke Alarm with Battery Backup and Voice and Location Alerts meets the latest industry standards and is equipped with First Alert's Precision Detection advanced sensing technology to reduce cooking nuisance alarms and provides early ...The First Alert SM100V-AC Interconnect Hardwire Smoke Alarm with Battery Backup and Voice and Location Alerts meets the latest industry standards and is equipped with First Alert's Precision Detection advanced sensing technology to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency. Battery backup provides protection during power outages and superior features to help provide an early warning and guide your escape to safety.