Working Voltage: DC 3.3-12VWorking Current: Less than 20mA (Output Current: Less than 30mA)Sensor Probe Length: 8.8cm/3.46 inchSensor Pin Pitch: 5 mmSensor Cable Length: 1.2 /3.94ftSensor Connecting Port: XH2.54 2PDO Port: digital value output (DO output current is about 10mA)AO Port: analog value outputDigital Value OutputInstructions:1.+ connects power positive; - goes to negative. connect reversely or the chip will be burnt out. There is a LED power indicator at the P on the board. It will if the module operates normally.2.Clockwise/counter-clockwise rotate the blue potentiometer to increase/reduce the detection . For example, DO outputs low level when the moisture reaches 50% now, then I clockwise rotate the potentiometer to increase the detection . At this time, DO outputs a low level only when the moisture reaches a point higher than 50%.3. If you clockwise rotate the potentiometer to an extent that the LED indicator which marked S is light, that means the testing has been surpassed. Counterclockwise rotating to surpasses the too. The module will not work if the detection is invalid. NOTE: The adjustment only works for using the DO output.color:Black:ABSPackage Contents:3 x Soil Moisture Sensor Modules3 x Sensor probesOnly the above package content, other products 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.