No electricity is required to operate the cool bed 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. 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. Recommended for indoor and outdoor use. Two year limited warranty. 17 X 24 GREEN