Toshiba Dynadock 4K (PA5217U-1PRP) One simple USB 3.0 connection from your laptop enables 4K display output and all your essential peripherals for maximum convenience. Built-in video card supports one 4K display (up to 3840 x 2160) via DisplayPort or HDMI. Six (6) USB 3.0 ports provide maximum productivity.  Two easy-access front ports provide always on USB Sleep & Charge1 capability to charge your phone, camera or MP3 player even while your PC is off. Universal compatibility with Windows based PC brands Mac OS X supported driver available4, too. Versatility of a space-saving upright or horizontal slim design reduces cable clutter on your desk space. Super Speed USB 3.0 and USB 2.0 compatibility provides fast performance and convenience, too.