This Songbird Spa is a versatile and smart heated bird bath with 3 mounting options: deck mount, clamp mount and ground use. Built-in 75 watt heater keeps water from freezing down to -10 degrees Fahrenheit. Thermostatically controlled, costs only pennies to operate. Great for year round use as the cord tucks away for warm weather use. Shallow water level is safe for birds but still holds over a quart of water. 2 year warranty.