4 in 1 Dot Matrix Module (MAX7219) This is a Dot Led Matrix Module with a MAX7219 Driver chip. You will be able to add some great cool animation to your upcoming project by using this dot matrix display module. The individual module contains 88 LEDs, each of which is precisely controlled by the MAX7219 driver to produce the desired colour pattern. The main advantage of using this is that users will be able to control all 64 LEDs by simply connecting three output communication wires to microcontrollers such as Arduino, etc. It is also very simple to connect the two modules. Simply connect the previous breakout board's output pins to the new module's input pins, and you can connect as many DOT LED Matrix Modules to the Arduino as you want!!!  The MAX7219 Dot Led Matrix Module is a common-cathode serial input driver that connects microcontrollers to LED matrices. A 4-wire serial interface allows you to connect any common microcontroller to this module. Without refreshing the entire display, each output can be addressed. This module only needs three I/O lines to drive the display, making it ideal for microcontroller projects. To set the segment current of each LED, only one external register is used.  Wiring instructions: The left side of the module to the input port, the right to an output port When the control of a single module, simply input port connected to the CPU When a plurality of cascaded modules, input and output termination CPU, an input terminal of the second output end of the first module a module, the first two modules of the input terminal of the three termination modules, and so on. Pin connection: Dot Matrix Display Module to the Arduino Vcc 5V GND GND DIN Pin 12 CS Pin 10 CLK Pin 11 Package Includes: 1 x 4-in-1 Dot LED Matrix Module 1 x Connecting Wire Specifications Driver IC MAX7219 Input Voltage 5V Max. Operating Current 320mA LED Dimensions  32x32x6mm Weight  25 grams