A:Answer It's completely wireless. The box comes with two wires, though, that have some function.
First is the charging cable. It can plug into the USB port on the Xbox One or any USB port. So you'll need to plug the headset in to charge.
Second is a Media-to-headset cable. This is used to plug your phone (or anything with a small headset jack) into the headphones. It allows you to listen to music, movies, etc. from your phone while you are also receiving Xbox and party chat wirelessly. I use it occasionally when I'm playing a game and not chatting with friends... will plug my phone into it so that I can listen to podcasts or my music.
Hope that helps.