This is a small case for the EDTracker head tracker. If you built it yourself (it is quite easy) and used the protoboard method, this case is for you: https://edtracker.org.uk/index.php/diy/build-it/protoboard I have included a socket which can be attached with double-sided tape to your headphones. Then the edbox can be screwed in place with two short plastic screws. I am using a short usb charger cable as a strain relief so I don't have to plug/unplug the micro USB cable every time. Btw. EDTracker works perfectly with Elite Dangerous!