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 moduleModel: XH-M214Power supply voltage: DC 12VOutput mode: output switchHumidity range: 20-99% RHControl accuracy: 1% RHControl current: 10AUse Tips:Please follow the wiring diagram in the instructions. You can choose the appropriate wiring according to the load voltage you use1. 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 valueColour:As ShownMaterial:Plastic+MetalPackage Contents:5x Soil Humidity SensorOnly 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.