bluetooth, autonomy and good quality. Unfortunately the design is very poorly designed, the headphones can be tightly inserted into the ear without pressing down firmly with fingers, suddenly no longer low, its very small and of poor quality. Blame the design headphones that have a very low turnover and are especially badly drawn (too big and misguided). Too bad that the tips are not simple earphones with silicone sleeve, which would marry and especially sticking to the ear canal. Earphones unusable even in a quiet chair unless you have both hands on his ears, while for sports you can forget.
