Sorry, Sorry, got carried away at work. I am going to fix everything right now. Thank you all for being patient. It does not have a mic, it is the in ear style and they play quite well. I ended up with two pairs, so I figured I'd put one up on Listia. Thank you all for looking, and I am going to fix it all right now.
3.5mm, it is the standard size for headphones. It will work the majority of newer cell phones, ipods, cd players, and plug into computers to listen to music and or videos. It would not be applicable to an xbox controller or ps3 connection.