FIRST ALERT BRK SC9120B Hardwired Smoke and Carbon Monoxide (CO) Detector with Battery Backup, 1 Pack, White

Price: $65.00
(as of Sep 26, 2026 19:36:19 UTC – Details)


First Alert SC9120B is a hardwired smoke and carbon monoxide combination alarm designed for residential installation. The alarm includes battery backup for continued protection during power outages and an easy adapter for compatible hardwired alarm replacement. It features smoke and carbon monoxide detection, an end-of-life warning, and an audible alarm to help alert occupants when smoke or carbon monoxide is detected. Includes one white alarm unit for home safety installation.
2-in-1 smoke and carbon monoxide protection
Hardwired alarm with battery backup
Ionization sensor for fast flaming fire detection
Interconnectable with compatible First Alert and BRK alarms
Backed by a 10-year limited warranty