FIRST ALERT SC9120BA 120VAC Hardwired Ion Smoke & Carbon Monoxide Combination Alarm with Battery Backup

PRODUCT FEATURES:- Ionization Smoke Sensing Technology - Electrochemical Carbon Monoxide sensor - 9V Battery Backup - Single Test/Silence Button - Two Silence Features – Silences low battery chirps for up to eight hours or temporarily silences nuisance alarms. - Two Latching Features – Alarm Latch: Remembers and identifies initiating alarms. Low Battery: Identifies affected unit. - Perfect Mount - allows for easy alignment of alarm - End-of-Life Signal (CO) - 10-Year Limited Warranty