Price: $39.99 - $29.88
(as of Nov 12, 2025 05:25:59 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 Alerts 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
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 say
Customers find the smoke detector easy to install and consider it a great replacement for older units, offering good value for money. The functionality receives mixed feedback, with some units randomly false alarming. The battery life and lifespan also get mixed reviews – while customers appreciate the 10-year backup battery, some report it doesn’t last, and while some units last 5 to 10 years, others don’t meet the 10-year claim. The wiring receives mixed feedback, with customers noting that the connecting wires are the same as expected.
