HIGH COMPATIBILITY:The product includes an on-board voltage regulator which gives it an operating voltage range of 3.3 ~ 5.5V. It is compatible with low-voltage MCUs (both 3.3V and 5V logic). A miniature PC such as the for Raspberry Pi only needs an external ADC (analog signal to digital signal) conversion module to work. LONG SERVICE LIFE:The principle of capacitive sensing is used to detect soil moisture. It is made of a corrosion resistant material. It avoids the problem of being easily corroded and greatly prolongs its working life. INTUITIVE&CONVENIENT:It is poible to read the amount of real-time moisture present in the soil (for judging whether the soil is wet or dry) by linking the analog output (AOUT) of the module to one analog input (A0) of the Arduino. WIDELY APPLICATIONS:Through simple design, can automatic watering the vegetable garden, garden, control the flower pot soil moisture, all of electronic competitions and for the Arduino Raspberry pi design etc. ATTENTION:Since this sensor monitors the soil moisture according to the principle of capacitive sensing, it is reflected in different places where the soil moisture is different, the tightne is different, and the insertion depth is different. Even in the same place, the same depth is in the second. At the time of the second insertion, the moisture may be read lower than the first time because the soil has been loosened during the first extraction. If you are designing your own intelligent "Garden Computer" with an optional capacitive soil moisture sensor. No doubt, for an Arduino can convert your favorite pots into self-watering planters, keeping your plants from drying out and reducing the time you spend watering. Self-watering system is perfect for people frequently on vacation, and takes the guework out of watering. Plants draw up moisture as they need it! Colour:Black Material:composite material Technical Specifications:Operating voltage:3.3V~5.5V Output voltage:0-3V DC Interface:PH2.54-3P PCB interface description:VCC(external 3.3V-5V), GND(external GND), AOUT(analog output) Panel PCB Dimension:98mm x 23mm/3.86" x 0.91"(LxW) Cable Length:200mm/7.87" APPLICATIONS:Gardening & Farming; Moisture Detection; Intelligent Agriculture Package Contents:10 x High Sensitivity Capacitive Soil Moisture Sensor Kit 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.