DETECTS CARBON MONOXIDE: Model COB monitors CO and sounds a loud 85 dB alarm to signal evacuation to fresh air; LED warning light indicates hazard; Test/Hush button allows quick checks or temporary silencing AA BATTERY POWERED: This CO detector is battery-powered, installs without wiring, mount it on the wall or set it on a table, and operates during outages using two included AA batteries TRAVEL-READY DESIGN*: Compact carbon monoxide detector is suitable for use at home or for travel; lightweight design allows you to take it on the go to use in hotels or vacation rentals when detection is needed away from home TESTED & TRUSTED: This carbon monoxide alarm is rigorously tested to meet UL 2034 5th Edition standards, and is ETL Listed; includes a 10-year limited warranty on alarm BUILT FOR EVERY HOUSEHOLD: Designed to help provide dependable carbon monoxide monitoring for everyday residential use; supports renters, homeowners, and pet owners seeking added awareness and protection from CO hazards in the home