Specification:
Single module can drive an 8 x 8 dot matrix common cathode
Module Operating voltage: 5V
Module dimensions: 3.2 x 3.2 x 1.3 cm / 1.26 x 1.26 x 0.5" (LxWxH)
Holes with four screws, diameter 3mm
Modules with input and output interfaces, support for cascading multiple modules

Wiring instruction:
On the left block to an input port, an output port on the right
When the control of a single module, simply enter the port received a CPU
When more than 3 modules cascaded output input termination CPU, the input output termination module of the first two modules of the first one, the first two modules of the termination input terminal of the three modules, and so on

Taking 51 single chip microcomputer as an example:
VCC - 5V
GND - GND
DIN - P22
CS - P21
CLK - P20

Package Included:
2 x Max7219 8x8 Blue Light LED Display Module
1 x 11.8" Female-Male Dupont Cables 10 PIN