KEF M500 Hi-Fi On-Ear Headphones - Black The KEF M500 utilizes a 40mm neodymium driver to deliver its signature hi-fi sound audio, alongside copper-clad aluminum wire voice coils and mounted apertures in the acoustic chamber to optimize clarity. Thanks to KEF's unique multi-directional Smart Hinge, the M500's lightweight aluminum frame comfortably conforms to the shape of your head and folds up neatly after use. The KEF M500 features an integrated in-line microphone and remote volume/play control on a tangle-free flat cable for iPhone and other Apple products. The M500 sits comfortably on your ears, encompassing each with our own breathable and sweat-resistant memory foam ear pads. These pads also provide noise isolation and maximize bass performance. With an additional tangle-free cable, flight adapter, and complimentary hardshell case, the KEF M500 is designed for listening on the go.