Deluxe Solar Sipper Keep Your Birdbath Ice Free The insulated bowl of the Solar Sipper has a black plastic cover to absorb and hold the sun"s heat that keeps 40 oz. of water from freezing throughout the day even when the temperature stays as low as 20 o . Acting as a heated bird bath, the small opening in the cover allows birds to drink while keeping the water cleaner. Made in the USA Dimensions 9"Dia. x 3"H Portable for Easy Moving In Stock-Ships Fast