First Alert SMICO100-AC Combination Carbon Monoxide And Smoke Alarm

First Alert SMICO100-AC is a hardwired, interconnectable 2-in-1 alarm that protects your home from both smoke and carbon monoxide with a single device. It runs on 120V AC with a built-in battery backup, so it remains active during power outages and can interconnect with other First Alert alarms to sound simultaneously throughout the home. Built on First Alert's Precision Detection platform, it aims to reduce nuisance alarms while delivering early warning of both threats when present. As a dual-threat unit, it eliminates the need for separate smoke and CO detectors in many spaces, simplifying installation and maintenance. For best coverage, install units in hallways near sleeping areas and on each level of your home, and interconnect multiple units to ensure alert propagation across rooms.