With the thunderbolt 2 express dock HD, you can connect up to eight devices (including dual displays) to your Ultrabook, laptop or desktop. Thunderbolt 2 technology delivers powerful speeds that are four times faster than USB 3.0 and 25 times faster than FireWire 800. Virtually limitless configuration potential lets you add up to four additional Thunderbolt devices to customize your setup exactly to your needs and specifications. Versatile design supports dual displays and 4K cinema resolution. Express dock HD requires a computer with a Thunderbolt or Thunderbolt 2 port as well as Mac OS X v10.9 or later, or Windows 7 or 8. For displays that are not Thunderbolt technology-ready, the Thunderbolt port is backward-compatible with a Mini DisplayPort.