Can only agree with previous speakers! It is USB 3.0 !!! There are 9 contacts. It works and the average values are as high as dirkt connected to the motherboard, only stay the me finally saves the burrowing under the desk and pushing the head of the table ... Of course, it is also backward compatible for USB 2.0 and even 1.1 suitable !
Strong buy recommendation and thank you have that taken by the previous speaker I have my doubts.