First of all I used to love these headphones but, like other users I have found them to have a defective design: the left hinge broke a bit after four months but was still usable and the right totally went after 14 months. The design is very poor, and the construction even worse.
Despite contacting Fanny Wang directly they refused to do anything because it was over a year since I bought them. Amazon on the other hand have offered me a full refund.
I have now bought Bose Quiet 15s instead. They are a world apart: better ANC, smaller, more comfortable and look less like a DJ wanna be.