To check whether the USB device itself is USB 2.0 or 3.0, use USB Device Tree Viewer (on a computer). Then disconnect all your USB devices on the computer, and reconnect the USB in question. You'll see it appear on the sidebar on the left. Click it. On the right, scroll down about 1/4 of the page. In the section 'Connection Information', look at the Device Bus speed. These are what you should be looking for:
Device Bus Speed : 0x02 (High-Speed)
Device Bus Speed : 0x03 (Super-Speed)
- Open the Charms Bar by dragging the cursor to top right of the screen
or by pressing Win + C.
- Select Settings and then Change PC settings.
- Select the Devices under PC settings application.
As mdpc said, the device you plug the USB device into should have different signs or colours to show if the actual ports are USB 2 or 3:
USB 3 (the sign on the left image says 'SS' and the usb sign. SS = SuperSpeed as said above):
There are many more methods here.
Check Microsoft's website for info on the different signs you can see.