This analog capacitive soil moisture sensor measures soil moisture levels by capacitive sensing, rather than resistive sensing like other types of moisture sensor It is made of a corrosion resistant material giving it a long service life Insert it into soil and impress your friends with the real-time soil moisture data This module includes an on-board voltage regulator which gives it an operating voltage range of 3.3 - 5.5V This sensor is compatible with for 3-pin "Gravity" interface, which can be directly connected to the Gravity I/O expansion shield Applications: Garden plants Moisture detection Intelligent agriculture Operating Voltage: DC 3.3-5.5V Output Voltage: DC 0-3.0V Interface: PH2.0-3P Usage: Temperature Sensor Type: Vibration Sensor : Resistance Sensor Output: Switching Transducer Model Number: soil module Material:plastic colour:black Package Contents: 15 * Module 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.