The probe can be inserted directly into the soil. It is a digital display of soil moisture. When the humidity is lower than the set value, start the pump to start watering, and stop watering when the humidity reaches the set value. The operation is very simple. It is intelligent and humane. Specification: Item: Soil moisture controller module Model: XH-M214 Power supply voltage: DC 12V Output mode: output switch Humidity range: 20-99% RH Control accuracy: 1% RH Control current: 10A Use Tips: Please follow the wiring diagram in the instructions. You can choose the appropriate wiring method according to the load voltage you use 1. F0 set the starting humidity (the humidity at which the solenoid valve or pump starts to work), press the "SET" key to display "F0", press the "SET" key to display the start humidity, and press the +/ key to display the "SET" humidity value Colour:As Shown Material:Plastic+Metal Package Contents: 10x Soil Humidity Sensor Only the above package content, other products are not included. Note: Light reflection 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 +/- 1-3cm.