This product is a water level control module, it is designed according to the actual needs of water for household, and mines. It controls the high-current relay to control the water pump work and by detecting the level of the water, and realizes the automatic pumping of the water when the pool (water tower) is short of water. When the water is full, the purpose is automatically stopped, so the pool is always full of the water. The circuit has an LED indicator to indicate the working state. When working, the relay pulls the LED light, and when it stops working, the LED goes out. The product has the characteristics of small size, simple wiring, low power consumption and strong anti-drying . and the wiring ports are oriented in the same direction, which greatly facilitates the connection of the leads. Name:Automatic water level control module Working Voltage:AC 12V or DC 10-14V Working Current:Above 600mHA Load Voltage:AC: less than 250V; DC: less than 28V Load Current:Less than 10A Module Size:51x40x18mm Mounting Hole Spacing:44x33mm color:Green Material:plastic Package Contents: 1 x Water Liquid Level Controller Only the above package content, other are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.