USB 5.1 DolbyA(r) Digital Digital Foldable Headphones True 5.1 surround sound technology , 3 drivers in each earcup optimizes each audio channel and extends the bass, 15.4mm neodymium drivers for front/subwoofer, 12mm neodymium drivers for center, 12mm neodymium drivers for surround, Integrated multi-chamber design, Compatible with Windows XP, 2000, Vista and Mac OSX compliant, Includes travel case with built-in cord management