Open box return, item appears to never have been taken out of original packaging. 

Limited edition Astell&Kern Special Edition headphones by Beyerdynamic, like new, originally $1350, now $850 (including shipping and tax). 

From the headphone.guru:
"The bass was in a word: exquisite... [and they] offer treble that is highly detailed and
extended while never causing the hairs on the back of my neck to stand up.

I find the AKT5p’s a wonderful addition to the market as they are certainly unique when compared to the other closed-back top-of-the-line headphones. You no longer have to sacrifice a neutral/balanced sound signature, nor do you have to give up on sound-staging in order to have headphones that can isolate you from the outside world. Their build quality is top shelf, as is the comfort level that they provide."

High end audiophile quality at an open box price. 

Photos and description from the manufacturer: 

The AK T5p is collaborative product between beyerdynamic, a high-end audio maker that has introduced excellent audio products since 1924, and Astell&Kern, the world’s best portable audio brand.

Astell&Kern’s first headphone - AK T5p offers an amazing experience to those who seek the ultimate sound quality in a portable device.
  • Closed back design with improved Tesla drivers
  • Rated at 32Ω output impedance
  • Tuned to amplify the sound of Astell&Kern to create rich low-pitched tones and clear high notes for a truly unique listening experience.
  • The 2.5mm balanced terminal for Astell&Kern, which supports full-balanced output, produces new sounds that the previous T5p version could not.
  • 2.5mm to 3.5mm adapter is provided for use with the first generation Astell&Kern players as well as other mobile devices and portable players.