Fully balanced discrete design using dual Wofson WM8741 dac chips and their ACSS output stage. This unit has 2 toslink, 2 SPDIF (on RCA) and an I squared S input (NO USB), has user selected options for 2X, 4X or 8X oversampling and several choices of anti-aliasing filters. This is the first generation model, in excellent operating and cosmetic condition, with original box and manual (a single page sheet). Did not come with an AC cord but I can find a generic one to toss in if buyer needs one. Will ship in U.S. only. Asking $275 (new with shipping to North America was over $500). Great sounding DAC! Very smooth and detailed with excellent balance. More photos available upon request.