First Alert Smoke Alarm, Interconnect Hardwire Detector with 10-Year Battery Backup, SMI105-AC, 3-Pack
Original price was: $109.99.$89.99Current price is: $89.99.
Price: $109.99 - $89.99
(as of Feb 04, 2026 08:25:34 UTC – Details)
The First Alert SMI105-AC Interconnect Hardwire Smoke Alarm with 10-Year Battery Backup uses First Alert’s Precision Detection advanced sensing technology and meets new 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.
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 emergency
10-Year battery backup provides continuous protection during power outages
Through early warning interconnect, when one alarm sounds, all compatible* alarms will sound
Alarm indicator visually identifies the unit that initiated the alarm
End-of-life warning lets you know when it’s time to replace the alarm
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Original price was: $109.99.$89.99Current price is: $89.99.