We are know that the I/O Pin of Raspberry Pi is limited. So Raspberry come with LED dot matrix screen, it would be more trouble. But use special LED constant current control chip, basically only takes Raspberry Pi SPI interface (3 IO + 2 enabled) you can control 64 LED lights. LED dot matrix drivers became possible!
This product is a led-matrix dot-matrix-led-display modul, which compatible with Raspberry Pi B+ and B board. The insertion method for B+ is the same as that of B. The pin GPIO1 on Raspberry Pi B+ corresponds to GPIO1 on Raspberry Pi B.
Support Raspberry Pi B/B+
Driver chip : MAX7219
Dot matrix type: 8x8 common cathode red dot matrix
I purchase it for my raspberry pi, no soldering or wires needed. It is so convenience and low prices. But there is no instructions on how to use this items with the Raspberry Pi 2/B+/B/A+ , so I hope to be equipped with some product brochures to facilitate research. Later research by myself, it work well in my projects. (Posted on 5/11/2017)