Features: This product is developed according to the actual need of household factories and mine for pumping water, and control the high-current relay according to the water level of the detection pool (water tower), So as to achieve control. Small size, simple wiring, low power consumption, large switches 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 pump is automatically stopped when it is full. Power-supply voltage:AC9V-20V DC12V-28V. Control output: current 30A. Specifications: Material:Metal Type:Drainage Water,Pumping Water(optional) Note: Please allow 1mm errors due to manual measurement. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1x Liquid Level Controller