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 impre 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 for DFRobot 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 Size:98 x 23mm/3.9x0.63 inch Usage:Temperature Sensor Type:Vibration Sensor Theory:Resistance Sensor Output:Switching Transducer Model Number:soil module Colour:black Material:plastic Size:98 x 23mm Package Contents:6 * Soil Moisture Sensor Module Only the above package content, other products are not included. Note:Light shooting 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.