Other Smartphone Accessories -Digital Display Module Highlights Generic Digital Display Module Only one module can drive a common cathode array 8*8 Module Working voltage: 5V. Fixing screws with 64 holes with a diameter of about 3mm Module with input and output interfaces, supports cascading multiple modules Single module control, just input ports from CPU Wire length: approx. 20cm/7.87inch Size: approx. 128x 32x 13mm / 5.04x 1.26x 0.51 inch specification: Wiring instructions: The module left as input port to output port on the right. The control of a single module, simply an input port to the CPU Multiple cascading input termination modules CPU, 2 output termination modules, an input terminal input module, the output terminal of the first two modules of the first three modules, etc. 51 MCU, for example: VCC 5V GND GND DIN P22 CS P21 CLK P20 Package includes: 4pcs 20cm 5P Line MAX7219 LED Dot Matrix Module Note: Due to the setting difference of the light and screen, the items color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.