MAX7219 Dot Matrix 4-In-1 Display Module Control SCM Module for Arduino Raspberry Pi PIC Pi ARM

Features:
With 64 fixed screw holes with a diameter 3mm.
With input/out interfaces, support for cascading multiple modules.
A single module can drive a 8x8 dot matrix common cathode.
Module measure size in 128*38*13mm(5.04*1.49*0.51in).
Operating voltage: 5V.