No electricity is required to operate the Cool bed III and these beds are attractively designed and allow a cool spot for dogs. Simply add the recommended amount of water through the easy fill cap and adjust the comfort with the easy air valve. Our unique Cool Core diverts the liquid better than ever throughout the bed for advanced cooling power. The new nylon/vinyl exterior is tougher than ever. Being extremely affordable, the Cool Bed III is the choice for any dog owner looking to offer their pet a comfy, dry, cool place to relax. Recommended for indoor and outdoor use. Two year limited warranty.