This birdbath heater and de-icer has a low profile, sturdy aluminum base incorporating multiple thermostats for efficient, accurate temperature control and a 10 foot cord with abrasion protector makes this unit ideal for keeping a bird bath ice free all winter long. Large heating surface area runs cooler than conventional de-icers. Operates over a narrow heating range. 250 watts. Made in the USA. Measures approximately 4 1/2 inches in diameter.