First Alert 9120B 120 Volt Hardwired Smoke Alarm With Battery Back Up 5 Pack

Price: $92.52
(as of Sep 22, 2026 14:10:03 UTC – Details)


The product is a hardwired alarm, also confirm if the wiring polarity is correct and that all wire nut connections are secure. A loose neutral (white wire) connection within the home junction box could prompt a device malfunction. Promote greater household safety with the First Alert 9120B Hardwired Smoke Alarm with Battery Backup. This 120-volt AC smoke detector uses an ionization smoke sensor to reliably detect smoke from hot, fast-flaming fires and alerts you with a loud 85-decibel alarm.
Imported
Tamper resistant locking pins, single button silence test and loud 85dB alarm
120-Volt AC power with 9-Volt battery backup (included) to keep alarm functioning during power outage
Customers find the smoke alarm to be a perfect replacement that’s easy to install, with one mentioning it takes just 30 minutes to replace existing detectors. The product works well with existing mounting and wiring, and customers appreciate that it comes with batteries. They consider it a great investment, with one noting its economical multi-pack option.