@Vik what do you want exactly and how portable/pocket able? You can go up to desktop separate level of performance regarding DAC but not regarding output voltage of course and it would cost you almost the same (like separate stand alone desktop grade DAC/AMP with similar performance) in the dongle market. But really (thinking on W2)?
I don't understand the language (Chinese?), but found
this about the W2 – thanks for the tip! Will find more info too (about the W2).
(What I want? I want the closest I can get to a portable DAC-amp with great sound, with good enough output for headphones like Sundara and HD 600/650, ideally with EQ and a remote. It needs to be trouble-free with iPhones and Macs. I guess I'll, in the end, end up with two products instead of one.)