"Nelson Blue Devil" deicing element suitable for use in birdbaths, ponds, pet/horse water bowls, fountains. 120 Volts AC, 200 Watts. Prevents freezing in subzero temps. For use in all types of contains/buckets (metal, plastic, rubber) up to 5 gals. Thermostatically controlled heater costs just pennies a day to operate. Water proof, Sealed, Keeps water @ 40-50F. Ground plug. Mfg. by the Nelson Mfg. Co., Cedar Rapids, Iowa, USA. Cost $90 new & used only 2 months.