Feature: 1. The soil humidity sensor is easy to operate,light weight. 2. The sensor is automated for a more convenient using performance. 3. The probe can be inserted directly into the soil. This 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. 4. You can define moisture value of stop working at will. 5. The humidity control range is from 20~99%RH. Specification: Item Type:Soil Temperature Sensor Working Voltage:DC12V Control Current:0~10A Humidity Range:20~99%RH Control Accuracy:1%RH Size:52 x 43 x 16mm / 2.05 x 1.69 x 0.63in Weight: 30 g / 1.06 oz(approx.) Package List: 1 x Sensor Module Note: 1. F0 sets the stop humidity (the humidity of the solenoid valve or pump stops working)Press the “SET” button to display “F0” and press the “SET” button to display the starting humidity. Press the + / button to “set” the humidity value.2. F1 sets the starting humidity (the solenoid valve or the pump's humidity starts working)Press +/- to switch to “F1”, press “SET” to display the stop humidity value, press + / to set the humidity value.3. F2 humidity correctionThere is no need to correct the error during normal use. Simultaneous use of multiple modules to correct values facilitates unified management operations.