SainSmart 4 LED Display Dot Matrix Module for Raspberry Pi

Matrix RBP a Matrix RBP b

SainSmart 4 LED Display Dot Matrix 16*16 Module for Raspberry Pi

Product Description:
Support Raspberry Pi B/B+
Driver chip: MAX7219
Dot matrix type: 8×8 common cathode red dot matrix
Module size: 64.3 x 35.0 x 26.5mm

Note: The Raspberry Pi is NOT included, Dot Matrix Only.
This product is 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.

Document:
4 LED Display Dot Matrix 16*16 Module
User and Manual