It is a USB2.0 device! It is not stated clearly - not even on the box. I still do not know how to open the microUSB connector.. On a Galaxy Note 9 USB-C port it does not mount a 128GB microSD card (on a PC, standard USB port it is working well). 16 and 32 GB cards are working fine on both ends.
Very high quality and did not take too long to arrive. Very happy customer.