Yulong Sabre DA8 DAC/Headphone Amp with USB DSD. The unit is well maintained, I'm the second owner. I don't have the original box or manual.
Head-Fi Review - "The Yulong DA8 is supremely capable, among the absolute best DACs I've yet heard, pricing be damned. The headphone amp is good enough to be a serious tool rather than a mere bonus feature, and all the other features add up to make it quite the compelling device. But don't be fooled - the heart of the DA8 is excellent sound quality, and all the features are just a bonus. It would stand on its own, and justify the price, even as a pure DAC with no extras. I'd happily put the DA8 up against any sanely priced DAC and expect it to have a good chance of coming out on top. Once again Yulong comes highly recommended."