brand new and high quality brand new and high quality Description: Single module can drive an 8 * 8 dot for matrix common cathode Module Operating voltage: 5V/3.3V Module Dimensions: length 3.3cm X 3.3cm wide Modules with input and output interfaces, support for cascading multiple modules Wiring instructions: 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 To 51 single example: VCC 5V GND GND DIN P1.0 CS P1.1 CLK P1.2 Quantity:1pc