This is the default cable which is shipped with every Oudie 2 and Oudie IGC. It is designed to connect to 12V battery power to supply power to the Oudie (but works with up to 30V input just the same).
At the other end it has an Standard IGC pinout on the RJ45 connector which means it can connect with a wide variety of gliding devices seamlessly for data communication and to supply power to these devices. Most notably it will connect to Flarm devices through this port.