The Farm Innovators Heated Water Bottle is an easy to use bottle designed for rabbits, guinea pigs, birds, and small rodents. This thermostatically controlled unit will keep the water from freezing during the winter and is designed to operate only when necessary. It is easily refilled from the top and includes a brass drinking valve. The bottle uses only 20 watts of power to keep the water ice-free. It holds 32 ounces of water and attaches easily to the outside of the cage or hutch with included clips.