These Cool Pup Crate Fans provide a refreshingairflow for pets wherever they travel or while at home. Retractable grip allows the fan to be hung on a cagecrate or pet carrier Fans circulate the air removing warm air from the cage interior and can help to protect pet from overheating Quiet two-speed operation will not disturb pets Includes a built-in thermometer to measure ambient temperature Features a port to accommodate an AC/DC adapter (not included)The standard Crate Fan features a built-in thermometer tomeasure ambient temperature and a port to accommodate an AC/DCadapter (not included). The standard Crate Fan comes in Silver. An optional Cooling Cartridge features a freezer packinsert and snaps onto the front of either model fan to addextra cooling power for up to two hours. A 6-Volt AC Adapter allows the fan to be plugged intoan electrical outlet. Attractively packaged forresale. Size: Measures 6-¼" L x 2" D x 8" H Powered by four "C" batteries (not included) Warranty: Manufacturer's Two YearWarranty