The blue tooth connectivity is flawless. Returning it ASAP. My applications was not along those lines. I even like using it to read with and highlighting text in a book. The only downside to this is the thong that comes with it, of course, did not fit. Sounded like my speakers were blown and that was on half volume! ABER: es rutscht! It was very thick. very good phones , they do not completely block exterior sounds but once you are listening there is no problem. The 80ohm has thicker winding wires and a long-throw driver - capable of higher volumes though a tad slower), the 250ohm has a short throw-driver (faster though more bright).