The sound card is working on your Mac mini without driver under Windows XP!
Since the Mac mini does not have a microphone input and a headset should be connected, this was a cost-effective solution. For less than 5 euros was better not to ask yourself how you can produce a sound card - but it works. I had my doubts in this regard.
The commissioning was quite simple. Unpacking and plug socket in the Mac Mini USB. Insert headset into the colored jacks (jack) and after a few seconds everything works.
The intelligibility of the microphone is absolutely fine with the headphones I could hear no noise. What more do you want?
Since the USB sockets are mini in Mac quite close to each other is the USB sound card 2 slots. If a short USB extension (25-30cm) would have been as adding it, I would not have understood the world.
Therefore I can really recommend this stick for use with headset on the Mac!