The Deckard is a versatile performer: headphone amp / DAC / preamp rolled into one visually striking package. It also packs a punch sonically - Class A power. With a three position gain setting, it will drive power thirsty headphones, as well as providing hiss free performance with sensitive IEM's. For more details, read the well received review from Michael Lavorgna at audiostream.com. His first thought when listening through the Deckard was - "they should have charged more." I am the original owner. Purchased the unit in late 2015. Serial #D1101454. The "8/10" rating is conservative - the Deckard is in excellent condition. Comes with power cord and USB cable. Thanks for looking.