First Alert SMI105-AC Interconnect Hardwire Ionization Smoke Alarm with 10-Year Battery Backup

First Alert SMI105-AC Interconnect Hardwire Ionization Smoke Alarm with 10-Year Battery Backup. First Alert's Precision Detection advanced sensing technology and meets industry standards. Interconnect multiple alarms together to help provide an early warning throughout your whole home and have peace of mind knowing the 10-year battery backup provides continuous protection in the event of a power outage.