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LED matrix 8×8 is a system of 64 mutually connected LED lights which use MAX7219 driver to light the way they are programmed, and all that is on one board and is really simple to use. You can use them for printing letters or symbols, showing texts and similar. It is possible to connect more modules with just a few wires and control with more matrixes at once.
The product is good. Recommendation for everyone who uses it on an Arduino device and its drivers for the MAX7219: The connection lines should be as SHORT as possible, otherwise there will be interference and the reception of wrong information and the LED matrix will start showing 'nonsense'