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 meters /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 positive; "-" goes to negative. Don't connect reversely or the chip will be burnt out. There is a LED indicator at the P mark on the board. It will if the module operates normally. 2.Clockwise/counter-clockwise rotate the blue potentiometer to increase/reduce the detection threshold. For example, DO outputs low level when the moisture reaches 50% now, then I clockwise rotate the potentiometer to increase the detection threshold. 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 threshold has been surpassed. Counterclockwise rotating to surpasses the threshold too. The module will not work well if the detection threshold is invalid. NOTE: The threshold 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 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.