It's a simple XLR female to 3,5mm jack adapter. It does just that, nothing more, nothing less.
I currently use it to connect my mic to my computer, but I'm thinking of buying a external soundcard. Your computer should immediately notify you once you have connected something to it (in my case, a microphone).
The coiled cable is relatively sturdy, and hasn't had any cracks in it. The plastic seems to be a good quality too. Overall it's a good product, and I would recommend it to anyone.