Safely maintains open water to 20 degree below zero Fahrenheit. 18 in. cord blend. Virtually indestructible. May be spray painted any color. Thermostatically control. MET listed. Durable enamel finish is easy to clean. Warranty: 3 years limited. Made from aluminum. Natural color. 6.5 in. L x 3.25 in. W x 1 in. H Unique design arent the only reasons Ice Eliminator is a best seller. Our solid aluminum housing keeps the unit from falling out of the birdbath and the attractive rock-like design blends naturally with any birdbath. Spray paint any color to match any birdbath. Will not calcify, rust, or leave stains in birdbaths. Wont burn or melt plastic birdbaths.