Class part, could easily be coupled with the mobile phone (was also in the compatibility list Manufacturers). Duration, range, sound, design I'm thrilled :-). Very positive I think that the headphones are easily connected via jack, so replacement is easily possible. The deduction of points there for which I currently see no chance to change the battery. This sucks, and sucks for the environment when the entire device must be in the bin simply because the battery in 2 years or so down is. Btw. - If who knows a trick how to turn is to come, let me know ;-)