The left headphone has never worked. I realize that I puchased a reconditioned product but I thought that it would be in working order. Fortunately for me my right ear is my worst ear so I use that headphone exclusively.The "TUNe" setting is very difficult to adjust it crackles and squeals until just the right spot is found.I would not have ordered this item had I known it was not going to be in good working order. In my view your Quality Control Dept. did a very poor job!