This is a 2-week-old pair of Numark PHX USB + Analog DJ Headphones. It comes with a pair of removable cables: 1 with a 3.5mm end that works with computers and portable media players and 1 with a USB interface that plugs into your computer. It also comes with a 1/4" adapter that screws on top of the 3.5mm cable. The earpads are interchangeable and you're given two sets: smooth vinyl and soft velour ear pads. Everything is included along with the retail packaging (see pictures).

More info and specs: http://www.numark.com/product/phxusb

Selling these to get a more expensive pair of headphones.