HIGH COMPATIBILITY: The product includes a built-in voltage regulator, giving it an operating voltage range of 3.3 to 5.5V. It is compatible with low-voltage microcontrollers (3.3V and 5V logic). A miniature PC like Raspberry Pi only needs an external ADC (analog-to-digital converter) module to function. LONG LIFESPAN: The capacitive sensing principle is used to detect soil moisture. It is made of a corrosion-resistant material. It avoids the problem of easy corrosion and significantly extends its lifespan. INTUITIVE AND PRACTICAL: It is possible to read the amount of moisture in the soil in real-time (to determine if the soil is wet or dry) by connecting the module's analog output (AOUT) to an analog input (A0) on Arduino. WIDE APPLICATIONS: Thanks to its simple design, it can automatically water vegetable gardens, flower gardens, monitor soil moisture in flower pots, and is suitable for all types of electronics projects, including Arduino and Raspberry Pi designs. CAUTION: Since this sensor monitors soil moisture using the principle of capacitive detection, the reading will vary depending on the soil moisture, humidity level, and insertion depth. Even in the same location, the reading will vary depending on the depth. On the second insertion, the moisture reading may be lower than the first time because the soil has loosened during the first extraction. Technical specifications: Operating voltage: 3.3V ~ 5.5V Output voltage: 0-3V DC Interface: PH2.54-3P PCB Interface description: VCC (3.3V-5V external), GND (external GND), AOUT (analog output) PCB Panel dimensions: 98mm x 23mm / 3.86 \" x 0.91 \" (L x W) Cable length: 200mm / 7.87 \" APPLICATIONS: Gardening and agriculture; Moisture detection; Smart agriculture Package includes: 5 x High-sensitivity capacitive soil moisture sensor kit Note: All data are manual measurements, please allow 1-3 cm error. Due to the light and screen difference, there will be some color difference, according to