This is a functioning Nintendo Entertainment System, and it's built into a Nike Air sneaker. What a crazy, mixed-up world we live in! Hoo boy!
It's unlikely that this is anything other than a one-of-a-kind modification, as no one would be insane to mass produce such an item. After all, who the hell would have any use for a sneaker with an NES built into it? But hey, you've got to give them credit for making something completely unique.