|MAX7219 controller (SMD) with pluggable 8x8 red LED matrix display|
An 8x8 red LED dot matrix, driven by an SMD MAX7219 on a separate, pluggable board. The boards can be daisy chained to make larger displays and are controlled via a serial bus.
Pin headers are supplied separately and can be soldered onto the sides of the display, or you can solder one display directly to another using short wire links.
See the article in the June 2017 issue, titled "El Cheapo Modules, Part 7: LED Matix displays".