Easy to use, this self-watering DIY kit is perfect for monitoring soil moisture very efficiently as it automatically wateres your plants and flowers Automatic Irrigation System, combines pump, pipe, soil moisture sensor and 4-channel 5V relay module in one plant irrigation system, including kit for the entire for Arduino DIY drip irrigation system A capacitive sensor, which you place in the soil around the plant, and through a second and a main board, you can talk to the plant. Do your plants need more water to rehydrate to see if they are dehydrated Always take care of your plants, the system can automatically water your plants. When your soil gets too dry, the pump kicks in and water flows into the tubes and pot. You don't have to worry about your plants when you go on vacation Capacitive Soil Moisture Sensor: Working voltage: 3.3~5.5VDC Output voltage: 0~3.0VDC Interface: PH2.54-3P Size: 98x2m (LxW) Pin: Analog signal output, GND, VCC 1 channel 5V relay module: VCC: Connect to 5V positive power supply GND: Connect to 5V negative power supply Mini water pump: DC voltage: 3-5V Outlet diameter: 0.29 inch/7.5mm Outlet inner diameter: 0.17 inch/4.5mm Water inlet diameter: 0.19 inch/5mm Drive mode: brushless DC design, mesh drive, 300 hours of continuous working life Vinyl tube: Length: 39.37 inch/400cm color: As shown Material: PCB+PVC Package Contents: 4*Capacitive Soil Moisture Sensors 1*4-Channel 5v Relay Module 4*Water Pumps 1*4M Water Pipe 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.