Power-saving display: the I2c oled display performs the traditional LCD display and with lower consumption sicne the IIC (I2C communications) simplifies connections; Please note that these I2C OLED display module comes without pin headers More details: use compatible with , ESP8266, ESP32, STM32, etc.;Operating temperature: -40 - 85 Celsius; Resolution: 128 x 32 Good compatibility: this i2c oled display module is compatitable with 4B/3B+/3B/2B/Zero, compatitable with , also compatitable for ESP8266, ESP32, STM32, etc. Driver IC: Size: 0.91 inch OLED Size: 38 x 12 mm Interface type: IIC interface Pin description: GND: power ground VCC: Power + (DC 3.3 - 5V) SCL: clock line SDA: data line Colour: Blue (Blu-Ray) Material:ABS Package Contents: 5 x I2C Display Module Only the above package content, other products are not included. Note: Light reflection 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.