This is a simple six wire cable. Great for jumping from board to board or just about anything else. There is a 6-pin JST RE connector on both ends. These are simple jumper wires used on standard 0.1" breakaway headers.
Getting started guide for the Large Digit display driver board. This tutorial explains how to solder the module (backpack) onto the back of the large 7-segment LED display and run example code from an Arduino.