First Alert Hardwired AC Smoke and Carbon Monoxide Detector with 10 Year Sealed Battery Backup, BRK SC9120LBL

The First Alert BRK SC9120LBL Hardwired Smoke and Carbon Monoxide Detector features an ionization smoke sensing chamber and an electrochemical carbon monoxide sensor. The 10 Year Battery Backup allows for continued monitoring, for the life of the alarm. Intelligent sensing technology is designed to reduce nuisance alarms; one button silences them if they do occur, and also tests detector functions. The latching alarm indicator automatically identifies which unit initiated the alarm, even after the conditions that set off the alarm have subsided. And an end-of-life signal enhances your safety by letting you know when it's time to replace the unit. Two locking features prevent battery tampering, and installation and connection to AC power is easy with the "quick-connect" wiring harness. Connect it to compatible BRK or First Alert alarms within a single-family residence; connecting will sound all the alarms together.