Liquid Level Controller Water Level Detection Sensor Module The product is based on the detection tank (water tower) level to control high current relay to achieve control. Specification: Size: 6 x 5cm \/ 2.3 x 2 inch Operating voltage: 9-12V Relay: 10A Features: It is small, simple wiring, low power consumption, high switching capacity, strong anti-interference, features high stability. When stably pool (water tower) water pump the water, it can automatically open the pump automatically stops pumping to full. Packing included: 1 x Water level switch sensor controller (without Stripline\/probe)