This is a super simple adapter cable that has a 1/8” (3.5mm) male cable on one end, and a female DIN-5 cable on the other end. End to end, the cable is about 6 inches (15cm) long. For added flair, each end is red and the cable in between is black.
This adapter follows the official MIDI TRS spec. Specifically, the following table lists which devices are compatible with this cable: