Feature: Driver chip: SSD1309 driver. Support interface: 7-pin SPI/4-pin IIC. Resolution: 128X64. Display size: 1.54 inches. Display Color: White/Blue/Yellow. Module size: 42.4 x 38 (mm). Display area: 35.052 X 17.516 (mm). Pixel pitch: 0.274 X 0.274 (mm). Pixel size: 0.254 X 0.254 (mm). Number of pins: 5PINQ.54 pitch single row pin headers, of which the 5th pin RES pin is not used by default) This is 4 pins. Perspective: full perspective. Working temperature: -40°C~70°C. Working voltage: 3.3-5.5V (do not use other power sources). Description: 1. GND: Power ground. 2. VCC: Power supply is 3.3V~ 5V (do not use other power supply). 3. SCL: SPI clock line. 4. SDA: Wire. 5. RES: Reset pin. 6. DC: Data/Command Select Pin. 7. CS: Chip select signal, active low. (The CS pin cannot be left floating. If you do not need to use chip select, you can directly connect CS to the power ground. If it is floating, the OLED will not work stably.). Description: 1. GND: Power ground. 2. VCC: Power supply is 3.3V~ 5V (do not use other power supply). 3. SCL: SPI  clock line. 4. SDA: SPI  data line. 5. RES: Reset pin. Package includes: 1 x Screen