Got the same ones and agree with those comments.I have some Sennheiser RS 120 wireless headphones and they are s**t. The sound was okay but they get a load of interference and now the volume and tuning dials are fucked and you have to wobble them around to get the sound to come through both ears properly. A mate bought the same set and has the same problem.
They are an older model so the design may have improved in the last couple of years.