I bought two, one USB-C the other Lightning. I also have another DAC, a Hidizs Sonata HD 2 (S) with the D firmware, as well as many IEM's and USB Audio Player Pro. I tried the Tin P1 planar with Adele's 21 first. A magical experience with the Hidizs. With the new Dongle, very quiet, and the hardware volume control has no effect, higher, lower, same volume regardless. I fiddled about, altered settings on my phone and in app. Plugged and uplugged, closed app, etc. Tried my Little Bear B4-X tube amp in the end, still not much volume control until the last few mm of the dial. No Joy, no heart, no magic.
So I figure I'll hand it a soft ball. The BLON bl03's with Amazon music. It works, Android system volume rather than hardware volume, so it never gets loud, but I can listen to music, then I try just plugging the BLON into the phone Jack, (OnePlus 6, still has one) then I had to turn the sound down, and the music suddenly has texture, life. Bass. Still at least it's pretty.
Do not buy this trash.
EDIT: Just bought the 9 Euro OnePlus USB-C to 3.5mm adapter. I'll let you know how it sounds.