The headphones have a good sound and the technique funktionier without complaint. One took place does not let through problem by far too high strap tension that can not be changed and also by changing the fittings as well as after prolonged use. The headset must be removed to get the painful pressure of the ears repeatedly. We have not even particularly big heads. A second problem lies in the smooth operation of the volume control. If you move your head, slide the seats of the volume control on the outerwear and brings with the sudden change in volume eardrums in danger. We always try to prevent this by pasting over with adhesive tape. A tedious but necessary measure.