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 DFRobot 3-pin #34;Gravity #34; interface, which can be directly connected to the Gravity I/O expansion shield Features: Supports 3-Pin Gravity Sensor interface Analog output Applications: Garden plants Moisture detection Intelligent agriculture Specifications: Operating Voltage: DC 3.3-5.5V Output Voltage: DC 0-3.0V Interface: PH2.0-3P Size: 99x16mm/3.9x0.63 #34; Quantity: 1 Set