Recommendation: do not buy if you hoping to invite so
The function of the micro-connector also is unclear to me! Just hanging around just so.
As a pure USB hub there are much better and indeed as USB 3.0 (z. B. 4-way aluminum anchor with an adapter to Micro A).
NB .: I assume that part is identical to kwmobile 3in1 Micro USB Hub Adapter for Dell ... by KW-Commerce