Wangdd22 MAX7219 Dot Matrix Module For Arduino Microcontroller 4 In 1 Display with 5pin Line Operating Voltage: 5V A single module can drive a 8x8 dot matrix common cathode Dimensions: 12.8X12.8X1.3 cm Fixing screws with 64 holes with a diameter 3mm Module with input and output interfaces, support for cascading multiple modules