The unit is very comfortable and it muffled all the outside sound which is awesome for gaming. Necesitas dos puertos usb mientras se está cargando, uno por el conector bluetooth y otro para el cable de carga. From weld splatter to galvanized coating. Not a deal breaker, but just something to be aware of. Giving it three stars because it technically works, but if I had to use it on a regular basis, the cheap and uneven construction would be a constant annoyance. Does not change the sound isolation or profile in any noticeable way unlike other more expensive replacements. I wore them for an hour or so for about three days, and they were fine thereafter after the strap materials softened a bit. If you follow the video, I got mine from Youtube, it is actually not hard to install at all. They are also extremely comfortable for wearing for long periods of time -- even if I fall asleep lying on them, which is remarkable. This is a lot thicker than I anticipated, which is a good thing!