The Solar Sipper is the best product for clean, fresh drinking water for wild birds on the market today. This water station does it all. Unlike a birdbath, it covers the water to keep it clean. It insulates to keep water cooler in the summer and warmer in winter. It heats with a unique solar design against winter ice. In winter simply fill with warm water, place in winter sun and the Solar Sipper will remain unfrozen all day to 20 degrees F. Holds 1 quart. Weight: 2 lbs.