Not a Mac peripheral, but I found this odd cable that is possibly what I am thinking it is... So it's a cable about 6 feet long. On one end is male USB and on the other end is male ethernet. I have heard of male USB to female ethernet, but not THIS. Is this what I think it is? What, getting internet from ethernet by your computer's USB port? It seems highly unlikely... I just can't think of anything else it would do. Is it maybe for some other device besides a personal computer?