Hardwired Combination Smoke and Carbon Monoxide Alarm with Battery Backup

About this item

This open-box listing includes a 2-pack of First Alert SC9120B hardwired combination smoke and carbon monoxide alarms. Each detector operates on hardwired power with a 9-volt battery backup, so it continues to monitor during power outages. The unit combines fire and CO detection with a single test/silence button, tamper-resistant locking brackets, and easy-adapter plugs for straightforward installation without rewiring. These alarms can interconnect with other compatible BRK and First Alert hardwired smoke and CO detectors. The latching alarm indicator clearly shows whether the alarm was triggered by smoke or carbon monoxide, even after conditions return to normal. With both smoke and CO protection in one device, this 2-pack helps ensure whole-home safety.