Place the sensors in your water tank, and it will monitor a high point and a low point.
The pump will start when the water is at the low point, and stop when the waterline hits the high sensor.
Uses 12vDC to operate.
Controls a load (a water pump for example) of up to 220vAC.
There is an LED to monitor the state of the relay.
PCB Dimensions: 2.5 x 1.6"