Feature: 1. PROFESSIONAL CHIP: This screen module has a built in SSD1309 driver chip, using SPI I2C interface communication, with stable working performance. 2. WIDE VIEWING ANGLE: Transparent blue screen, full viewing angle design, 128 x 64 resolution, providing a comfortable visual experience. 3. TWO INTERFACES: Screen module with expansion board, using four wire SPI and I2C two interfaces, strong compatibility, high transmission speed. 4. COMPATIBLE: Transparent display screen SPI control interface can access for Raspberry Pi, for STM32 and other main control boards. 5. EASY TO USE: 1.51 inch blue screen display with RGB module, compact structure, easy to install and use, clear display of a variety of information. Specification: Item Type: Screen Module Material: PCB Screen Size: Approx. 42.04 x 27.22mm / 1.66 x 1.07in Display Size: Approx. 35.05 x 15.32mm / 1.38 x 0.6in Pixel Size: Approx. 0.254 x 0.254mm / 0.01 x 0.01in Motherboard Size: Approx. 41 x 22.5mm / 1.61 x 0.89in Operating Voltage: 3.3V 5V Communication Interface: 4 Wire SPI I2C Control Chip: SSD1309 Resolution: 128 x 64. Package List: 1 x Screen Module1 x RGB Module1 x Connection Cable1 x Screw Package Note: Manual measurement, please allow some errors.