Just insert the capacitive sensor into the soil, you can the real-time data of soil moisture, an external screen, a motherboard, you can talk to your plants See if your beloved plant is thirsty and needs a little Applications: garden plants; moisture detection; intelligent agriculture, note: the humidity is when the voltage is small, the humidity is small when the voltage is , go back to confirm with a multimeter measurement.Specification.Operating voltage:3.3 - 5.5 Output Voltage:0 - 3.0 Interface:PH2.54-3PSize: 98 x 23mm (LxW)Material: ABScolour: BlackPackage Contents:1 set x Capacitive sensor(10PCS)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 . The measurement allowed is 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-dadangjia