The size is so small that you can carry with your earphone all the time, which is very convenient if your phone do not have 3.5 audio jack. The sound is reasonably good for the price. Tuning is for clear sound rather than powerful. If you want more thump, Periodic Rhodium is a better choice.
Works fine with my HD6xx and & quality better than the native MacBook jack but cannot get it recognised on the MIDI controller with my TRRS earbuds. Suspect it’s looking for different wiring protocol or a dead unit.
Using with a One+ 7 Pro, with prior USB-C to 3.5mm, I would get loud pop on plugin and unplug, this unit has merely a muffled click. Listening to Patrick Sweaney, Them Shoes, with the non-DAC converter I've replaced with this purchase, the pearls vibrating on the bottom of the share sounded like static, with this DAC converter, I can hear what it truly is. Liking this a lot.