0.91 INCH OLED Display: Resolution is 128*32,Very Clear,Black background with white text display. The main chip is ; supports DC 3.3V to 5.0V supply. Working Temperature: -30 degrees ~ 70 degrees These I2C OLED display module comes with pin headers, you don't need buy it separately it can be used for PIC, AVR, ESP32 ESP8266, ARM and . etc. The display performance is the traditional 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 Ground VCC: Power + (DC 3.3 ~5v) SCL: Clock Line SDA: Data Line Specification: Screen size: 0.91 inch Interface: IIC The main chip is: ; Operating voltage: 3.3V~5.0V power supply. Working Temperature: -30 degrees ~ 70 degrees Display area: 22.384 x 5.584 (mm) Interface Type: IIC Interface Number of Pins: 4Pin Colour:Blue Material:PCB Size:38x12mm Package Contents: 4 * OLED Display Module Only the above package content, other products are not included. Note: Light 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.