This is a good question. I've just tested it with a Hama high-speed card from my DSLR. I tried it about 10 times, trying to slip it in a bit skewed. I'm happy to report the CF was guilded in with perfection, and had a reassuring gradually narrowing/tightening feel as the card reached the fully seated position.
By Trisha Xuk on 21 October 2014
It has a USB 3.0 Micro-B plug, which is the shallow, full width one with the indentation. Not a traditional Micro or Mini connection, as t hey're USB 2.0. But you get the cable with it.
By JG on 01 August 2015