Keeps water from freezing in subzero temperatures. Plug cord into outlet during winter. Heater operates automatically. Thermostatically controlled with 60 watts of power. Holds 5.5 quarts of water. Measures 15.75 inches in diameter and 4.5 inches deep Size is 5.5 Quart. Dimensions are 15 X 15 X 4.5 UPC Code = 085045009195