This product is developed according to the actual needs of household factories and mines for pumping water, and controls the high-current relay according to the water level of the detection pool (water tower), So as to achieve control. It has small size, simple wiring, low power consumption, large switch capacity, strong anti-interference, and stable function high sexual characteristics. It can stably realize that when the pool (water tower) is short of water, the water pump is automatically started for pumping, and the pump is automatically stopped when it is full. Specifications: Power supply voltage: 9V-12V (both AC and DC) (Note: For safety reasons, please do not use a switching power supply) Control output: current 0~10A (genuine relay) Control power: 0~1KW/220V (theory can control 2KW) Board size: 60*50*25mm This product does not need to purchase a probe separately, and the probe can be replaced with a household wire.