This analog capacitive soil moisture sensor measures soil moisture levels by capacitive sensing, rather than resistive sensing like other types of moisture sensorIt is made of a corrosion resistant material giving it a long service lifeInsert it into soil and impress your friends with the real-time soil moisture dataThis module includes an on-board voltage regulator which gives it an operating voltage range of 3.3 - 5.5VThis sensor is compatible with 3-pin "Gravity" interface, which can be directly connected to the Gravity I/O expansion shieldApplications:Garden plantsMoisture detectionIntelligent agricultureOperating Voltage: DC 3.3-5.5VOutput Voltage: DC 0-3.0VInterface: PH2.0-3PSize: 99x16mm/3.9x0.63 inchUsage: Temperature SensorType: Vibration Sensor: Resistance SensorOutput: Switching TransducerModel Number: soil modulecolour:blackMaterial:Plastic + metalPackage Contents:10 * ModuleOnly 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.