content: I use these for blocking out noise at the office, and then take them home for gaming. They are very versatile and the sound quality is very good. They do a great job of blocking out external noise, that dog barking, that guy in the next cubical that has to yell into his phone, or that guy that has to smack his lips when he's chewing gum. Sometimes its just enough to put them on, flip the power switch and relax, without actually hooking them up to listen to something. I am very comfortable wearing them from 8am to 5pm, while it would be nice if my ears had a little more ventilation, but that would defeat the purpose of the noise canceling.