Question about Samsung SM-R324 Gear VR incl. controller (2017)

There is no need for a UBS adapter. There are no electronic components. It's just a holder for your Samsung phone.

However, I don't recommend the device at all, because after a few minutes of playing with a 3D app, the phone turns off due to overheating. I tried it with my Samsung Galaxy S7 Edge, made sure no other apps were running at the same time, and still only managed to play for about 5 minutes.