Carbon Monoxide Alarm - AC Powered (Battery BACkup) - Bulk Pack
Combination alarms offer protection from two deadly threats in one unit. Combo alarms can save space, and you'll only need to change and test batteries in one device rather than two. 10-year sealed battery alarms offer a variety of benefits to the millions of Americans who rely on continuous battery-powered smoke and carbon monoxide detection in their homes. The alarms are powered by sealed, long-life lithium batteries for 10 years (the life of the alarm), meaning they are always on.