Working Voltage: DC 3.3-12V Working Current: Less than 20mA (Output Current: Less than 30mA) Sensor Probe Length: 8.8cm/3.46 inch Sensor Pin Pitch: 5 mm Sensor Cable Length: 1.2 /3.94ft Sensor Connecting Port: XH2.54 2P DO Port: digital value output (DO output current is about 10mA) AO Port: analog value outputDigital Value Output Instructions: 1."+" connects power ; "-" 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 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 Material:ABS Package Contents: 3 x Soil Moisture Sensor Modules 3 x Sensor probes Only the above package content, other 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.