Through adjusting the potentiometer to control the soil humidity threshold,can automatic watering the vegetable garden, garden, control the flower pot soil moisture. Include Relay module, Mini water pump, Plastic Battery Storage Case Holder, USB power cable, Jumper wires, 0.5m Vinyl Tubing and Soil Moisture Detector Module. Note:Do not pour water directly on the sensor. The humidity of the water will rust the sensor. Easy assemble, make your life more automated, particularly suitable for people who travel frequently! DIY irrigation system automatic watering pump soil moisture sensor module kit Specifications: Test the relay module: connect the vcc relay module to 5v, gnd to ground, into gnd, the relay bounces, and when inside is suspended, the relay recovers, so you can hear the relay "" sound repeatedly. Test the Soil Moisture Sensor Module: Connect the fork probe and the transmitter module with two lines, the transmitter module. Vcc is connected to 5V, GND is ground, right after power-on, red power light is always on, green (blue) color indication. The lamp flashes softly once, the fork probe is inserted directly into the water, and the green (blue) light is on. Connect the pump line to 5v, the black line is grounded, the pump works, pay attention to the test for 1 second, and it is not allowed to work in the air for a long time. Do not pour water directly on the sensor. Moisture in the water will rust the sensor. The kit can automatically water the vegetable garden, garden and flower pot soil moisture control. Type: automatic irrigation system kit Power supply: DC 5v power bank (not included) / 4 x AA batteries (not included) Features: easy installation, soil moisture sensor, wide application Hose Length: 50cm/19.69 inch (.) Colour:black Material:pvc Size: 8x 8 x 4cm Package Contents: 1 * Relay Module 1 * Soil Moisture Probe & Comparison Module 1 * small water pump 1 * Battery Box 1 * USB power cable 10 * Connection Line 1 * 50cm Tube Only the above package content, other products are not included. Note: Light 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.