2PK DC CO/Smoke Alarm

First Alert, 2 Pack, DC, Battery Operated, Carbon Monoxide & Smoke Detector Combo Pack, Install reliable fire and carbon monoxide (CO) protection with the First Alert SMI100 Battery-Operated Smoke Alarm & CO400 Battery-Operated Carbon Monoxide Alarm Safety Value Pack. The SMI100 Smoke Alarm features First Alert's Precision Detection advanced sensing technology and meets new industry standards. While the CO400 carbon monoxide alarm easily installs and provides reliable CO protection.