Features:The product is based on the detection of the pool (water tower) water level to control the high current relay to achieve control. With small size, simple wiring, low power consumption, large switching capacity, strong anti-interference, high stability features.Can be stable to achieve the pool (water tower) when the water automatically open the pump pumping, pumping to the full stop automatically when the pump.This product does not need to buy another probe, with the home wire can replace the probe. Automation equipment manufacturers as a complementary product of the best choice Specification:Name: Level control switch moduleVoltage: 9-12VDCWeight: Approx.32g/1.1ozPackage list:1 x Level Controller Switch Module( cable/probe not included)Note: The so-called probe is a wire with a plastic reel to tie the thread, with the home wire can be directly induced, the thread stripped about 1 cm, so that itcan be directly induced bare wire.