Kidde Carbon Monoxide Detector, Plug In Wall with 9-Volt Battery Backup, Digital LED Display - 2 Pack

Easy Installation - simply plug-in to a standard, 120V outlet in your home 9-volt battery backup provides protection during a power outage Digital LED display shows the level of carbon monoxide the CO alarm is sensing 85-decibel alarm announces when carbon monoxide is detected Peak Level Memory records the last time carbon monoxide was detected or when the unit was last tested