it is the ideal complement for a ultrabook! gigabit network, 1 HDMI (which works very well for me and with the sound on the HDMI function), usb hub 2 and 3 and especially food that can leave the original one in the briefcase of the computer! least one star because with an external hard drive USB 3 in the computer does not start .. ?? ... weird not to try another case because I do not have one! ras usb 2 only drawback: not compatible Mac ...