First Alert Hardwire Smoke Alarm with 10-Year Battery Backup

Price: $82.99
(as of Sep 16, 2026 16:47:11 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
Customers find the smoke alarm works flawlessly, is easy to install, and appreciate its 10-year battery feature that eliminates the need for annual battery replacement. The product fits easily on old bases and customers consider it good value for money. While some customers report it lasts 7 years, others say it doesn’t last 10 years, and opinions about connectivity are mixed, with some finding it easy to connect while others report issues.