0.91 INCH OLED Display: Resolution is 128*32,Very Clear,Black background with white display.The main chip is ; supports DC 3.3V to 5.0V supply. Working Temperature: -30 degrees ~ 70 degreesThese I2C OLED display module comes with pin headers, you 't need buy it separatelyit can be used for PIC, AVR, ESP32 ESP8266, ARM and . etc.The display performance is the LCD display, it uses the very common I2C bus, and runs on the display driver, also lower consumption; IIC (I2C communications) simplifies connections.Note:Do not reverse VCC and GND. This will cause damage to the OLED display.Pin Description:GND: Power GroundVCC: Power + (DC 3.3 ~5v)SCL: Clock SDA: Data Specification:Screen size: 0.91 inchInterface: IICThe main chip is: ;Operating voltage: 3.3V~5.0V power supply.Working Temperature: -30 degrees ~ 70 degreesDisplay area: 22.384 x 5.584 (mm)Interface Type: IIC InterfaceNumber of Pins: 4PinColour:BlueMaterial:PCBSize:38x12mmPackage Contents:4 * OLED Display ModuleOnly the above package content, other are not included.Note: Light and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.