I am very satisfied with the purchased versions. The buttons are not cheap at all, very pleasant to the touch and to the eye, any USB cable can be inserted. However it is true that helmets with enormous jack (Dr Dree eg) may not be connected can not be easily (simultaneously use headphones € 200 on a phone whose audio quality is catastrophic ... ). I like being able to change the color of the hull the urge (part of which is removable), very easy to set up In short it is a product of very high quality (added to the sound of the name of the company, you might think that the product is German). I take off a star because I still looking for the slim side ... shame