Protect you and your family from the dangers of carbon monoxide (CO) poisoning with these battery-powered CO gas alarms! Includes patented fuel cell technology and a more accurate sensor that uses less current and is less sensitive to humidity and other gases than competitive brands. For additional security when sleeping in another room, the picture frame leg allows you to use the CO gas alarm at multiple locations like a nightstand or kitchen counter. Includes tools needed for surface mounting. Battery cover is designed with a safety feature that makes it difficult to close without batteries in the unit. Uses three AA batteries (included). CSA listed. Approved for use in RV’s.