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. Features a loud alarm and digital display (66-8797), long battery and sensor life. 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). Five year warranty. CSA listed. 1/box.