5 mm jack and it comes an additional connector for PC. I?ve had it for awhile now. I love all the colors that it came with but my wife likes the purple one. So now I love these shoes :) CON: No hardware included; hooks inadequate for heavy objects. Dont dive right in like myself and play RE7 from the beginning (Im a glutton for punishment). Definitely a must have for anyone who loves to kick back and relax. I cut off the cotton balls and it looks much better without it. I am 55", 115 lbs. I also love using this while doing housework and riding my bike.