Mine came with NO manual. Sturdy you can say This should be mentioned on the site. First initial install the charging case was wiped with alcohol and dried then inserted into protective case. NUNCA debemos olvidar de que se trata de unos auriculares bluetooth, por lo que no sería justa la comparación sin tenerlo en cuenta. Too small and as others have said, make a terrible ‘farting’ sound when you walk. The cord can still slide and adjust a bit through the clamp, but your headset will still remain secure on your person. Its too big gets in the way and is cumbersome to put on and off. I guess I should have returned but did want to drive to the UPS site. The insoles are quite cushion and I guess its memory foam because it springs back to form .