Closed dynamic reference headphones, which are improved model of AKG K550 headphones and provide spatial sound studio. They are equipped with two detachable cables - the first contains a universal driver with one button, and the other with three-button MFI driver that is compatible with a wide range of devices - iPod, iPhone, iPad, Android, Windows, Blackberry, or MP3 player or PC. They are fitted with special 50 mm drivers, which together with closed design of the headphones and passive noise reduction ensure accurate sound. Easy transfer and handling is ensured by folding system 2D AXIS. Headphones offer a frequency range of 10 Hz-25 kHz, sensitivity 97 db SPL/V and impedance of 32 Ohm. Included is a 1.2 m cable. Weight: 282 g, black colour design.