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 pressure protection. Material:plastic colour:White,black,red Package Contents: 1 set of water heater controller 1 * Accessories Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.