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. K&H's 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.