I have NZXT Phantom 410 case, I have connected mostly all the case cables except for those in the image :
I have looked in the case Manual but they don't say anything about these cables, even whats the name or what they do or where to connect them, So hopefully someone here tells me these information because thats my first PC build.
Thanks.
61 Answer
So after seeing the picture in the last comment, I'm confident that that is a 3 pin fan splitter. In this case, the manufacture seems to give you the ability to wire fans to one location that is stowed away with where the rest of the wires go (kind of a nice feature!).
At first I did not realize that they were part of the rest of the wires that came with the case. I thought they were separate pieces, like one of these: