This item is based on the actual use of domestic factories and pumping. It is based on the detection water level of the pool ( ) to control high current relay to achieve control pumping. Can steady achieve the pool (towers) automatically open the pump when of water, automatically stop the pump (solenoid valve) when full of water. Can be used in pond water tank, garage, basement flooding rains place where automatic drainage, etc. Feature - - Material: plastic and electronic components - Size: 3.5 x 2cm - Based on the actual use of domestic factories and pumping. - Features small, simple wiring, low power consumption, high switching capacity, strong interference, and functional stability - Can steady achieve the pool (towers) automatically open the pump when of water, automatically stop the pump (solenoid valve) when full of water. - Can be used in pond water tank, garage, basement flooding rains place where automatic drainage, etc - Using household wiring can replace probe, no need for another probe Package list: 1 x liquid level controller sensor module