After 2 weeks, the first headphones started quite unpleasant to clink.
Well, can sometimes happen that an earphone is broken, fortunately I still had the second pair.
This second pair has now given up the spirit ... at least half.
While the right handset works as it should be heard from the left every other step short a distance reminiscent of musical sound (and after less than 90 days use).
I wrote to the support again, I was not helped at the first defect, so I guess the situation again like a.
Conclusion:
Who apathetic lying on the bed without moving here can access courageously, everyone else should look for other products.