Kidde 21006406 Carbon Monoxide Alarm AC Wire-In w/Battery Backup

This essential device helps warn of dangerous carbon monoxide levels and is interconnectable with other Kidde devices, such as smoke alarms and heat detectors on one wiring network. The 9V battery backup provides continuous monitoring of carbon monoxide levels - even during a power failure. Alarm includes a Smart Interconnect System, which enables the unit to alarm in a carbon monoxide pattern and sound a different pattern when interconnected to a Kidde Smoke Alarm that is in alarm mode. Five-year warranty.