I bought these to use for work, both for meetings and listening to music while working. I used them primarily with Bluetooth, but they can be used wired with either a headphone cable or USB. I found that audio quality is amazing, isolation excellent. I only ever used 2 channel, but they are surround sound capable. These look almost completely new, just with light creasing on the pads. The reason for selling is that the bluetooth battery life if approximately 5 hours and I need something that will last a full work day. I wear a Large baseball cap and these fit well and snug, but if you have a really large head I suspect they will be too tight. These come with 3 original cables, box, packaging, and manuals. https://www.audeze.com/products/mobius