After a few years of use the cable of my old headphone was broken in several places, so I used the opportunity to modify this headphone. As a coincidence the case offers enough space to cover a MP3-Player, so it can be used there. That's why I cut the case on one side open, installed a rail to guide the player and fixed the connector in the inside. Now, the MP3-Player can be introduced into the case and connects automatically with the speakers. The comfort of wearing and the sound are impressive and with this modification the headphones can be used wireless on the way..