Auxiliary heating function, Water flowing warning. Pump control ventilation, Antifreeze function. Action failure sensor, Auto Defrost function. Automatic restart function,Temperature depletion. Compressor delay and strain protection. Material:plastic colour:White,black,red Package Contents: 1 * set of water heater controller 1 * Accessories Only the above equipment content, assorted merchandise are usually not included. Note: Light taking pictures and different exhibits may cause the colour of the article within the photograph barely various from the genuine thing. The size allowed error is +/- 1-3cm.