O2COOL 5-inch Pet Crate Fan for Cooling Dogs and Other Pets TWO SPEED OPERATION: To accommodate your pet, the O2COOL pet crate fan features high and low speeds. The fan boasts a quiet operation on both settings to keep your pet cool while making minimal noise and not spooking your pet. EASY TO INSTALL: Simply hang the bracket on the door or crate side, and turn it on! Fits most crates and carriers. BATTERY OPERATED: The fan runs on two D batteries (not included). To install, slide out the battery door and insert batteries following (+/-) marks, then replace door. Slide switch located on the side of fan to your preferred setting. If fan does not operate, verify batteries are installed properly. PORTABLE AND TRAVEL FRIENDLY: Keeping your pet cool and safe while travelling is so important! With a battery operated pet crate fan, you can now keep your pet safe and cool while on the go. DURABLE CONSTRUCTION: To provide long-lasting strength and use, this personal fan is expertly crafted using durable plastic construction with a patented fan blade design which extends the battery life while maximizing airflow.