New and improved Cool Pup crate fans keep pets cool, calm and comfortable no matter how hot it gets. These crate fans provide a refreshing airflow for pets wherever they travel or while at home. Retractable grip allows the fan to be hung on a cage, crate or pet carrier. Quiet, two-speed operation will not disturb or startle pets. It includes a built-in thermometer to measure ambient temperature and features a port to accommodate an AC/DC adapter (not included). An optional Cooling Cartridge features a freezer pack insert and snaps onto the front of either model fan to add extra cooling power for up to two hours.