First Alert Hardwire Smoke Alarm with 10-Year Battery Backup

Price: $86.99
(as of Oct 19, 2026 18:24:38 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 well with existing wiring and is super easy to install, particularly noting it fits easily on old bases. They appreciate the 10-year battery feature and consider it a good value for home security. The connectivity receives mixed feedback, with some saying it’s easy to connect to other units while others report issues. Durability opinions are also mixed, with some reporting it lasts 7 years while others say it doesn’t last 10 years.