Finally some air! The ProSelect® Two-Speed Pet Crate Fan provides a refreshing airflow for pets wherever they travel, or while at home. Retractable arms allow the fan to be hung on a cage, crate or pet carrier. Fans circulate the air, removing warm air from the cage interior, and can help to protect pet from overheating. Their quiet, two-speed operation will not disturb pets. The standard Crate Fan features a built-in thermometer to measure ambient temperature, and a port to accommodate an AC/DC adapter (not included). The standard Crate Fan comes in Silver. Powered with four 'C' batteries (not included). Perfect for travel use!