DAC, Headphone AMP, earphone AMP. Jitter free. USD D/A converter, plug-and-play, ... ,portable,PC HiFi DAC, portable D/A converter, Headphone AMP, earphone AMP. Hifi audio amplier, your best PC music partner Item ... -----20HZ-20K +-1.75 dB Packing list: Mainframe---1 Rubber cover--2 USB cable---1 patch cord---1 All products offer ...