XCSOURCE 5pcs Soil Moisture Sensor And Automatic Watering System for Arduino TE215 This is a simple water sensor that can be used to detect soil moisture. Can be used in module plant waterer device, and the plants in your garden no need people to manage. This is a must have tool for a connected garden! It will be helpful to remind you to water your indoor plants or to monitor the soil moisture in your garden. Operating voltage: 3.3V-5V Module dual output mode, digital output, analog output more accurate.