The sensor is perfect for environmental sensing and data recording: very suitable for weather station or cigar box control systems. You only need two wires for I2C communication: you will get relative humidity readings and very accurate temperature readings. Sensor: Only need to connect four pins. One for VCC, one for GND, and two data lines for I2C communication. The breakthrough board has a built-in 4.7k pull-up resistor for I2C communication. Easy-to-use high-precision digital humidity and temperature sensor. Colour: purple Material: metal Package Contents: 1 * Temperature And Humidity Sensor Module 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.