Bird Bath de-icer. 200 Watts, 120Volts. Ice free water all winter. Built-in thermostat. Stainless steel guard and auto shut-off. 3 Yr. warranty. Fits all types of bird baths. To test if working, plug outside and stick in a snow bank to see if snow starts melting. Or put in a freezer to see if works. Must be below 0 degrees to test.