This is a assembled ModuleThe product is based on the detection of the pool (water tower) to control the water level to achieve high current relay control pumping Sheung Shui. With a small, simple wiring, low consumption, high switching capacity, interference is strong, functional stability characteristics. Automatically open when you can stably pool (water tower) water pump (solenoid) pumping Sheung Shui,automatically stops the pump (solenoid) when full of water. Local flooding can also be used for automatic rain drainage, such as garages, basements, etc. PCB Size: 4 x 7 cmmaterial: metalPackage Included:1pcs x Assembled Liquid Level Controller Sensor ModuleNote:Light 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 +/- 1-3 cm.