is already useful

've gained this extension after much consideration. I have a surface2 and had my doubts if it fits here. But works fine. That is too loose placed it on the Surface, I just can not confirm, but is only connected to the USB connector and of course, not "bolted", so you can easily move it already - but not interfere. As a card reader this extension is super. I put a card inside (or a USB flash drive), once a new drive will appear to me and do not like my PC (Win 7), which lists all the drives always whether an SD card is in there or not.
OK, the charging socket is half covered here, of course, is not beautiful (you can not simultaneously charge) but the battery is indeed very productive. Of course, everybody has to decide for themselves. I would buy this card reader again.