Don't let falling temperatures put the deep freeze on your bird-watching activities with the Curved Oasis Mat Heater. Simply place this cleverly designed heater in any bird bath and plug it into a standard household outlet. Designed for many years of service, this energy efficient heater is made from a weather-resistant polymer material to resist corrosion and scale and will not rot or crack. Suitable for most basin designs, including those with an island, the curved design can assure ice-free water in sub-zero temperatures. Turn any bird bath into a four-season spa with the Allied Precision Curved Oasis Mat Heater. Five year warranty. Made in the USA.