Not perfect but good for the low price
My pa-316 just arrived

long press volume to turn it on,off short input selection (no aut bt) no pop sound turning it on,off

loose volume knob, like a steering wheel that only make the car turn after half an inch (hate it)

tone controls off neutral sound, clean sound even at max volume, above 12 o'clcok if you want it loud (volume better on a Fosi audio bt 20a), the difference on the volume from 12 o'clock to max is to big or not big enough how you interprest it (medium to loud from 12 to 2 o'clock) + a good bass

Gets varm playing loud (not alarming), a Fosi Audi bt20a don't get warm, 24v 6.75 psu instead of 24volt 4.5 a as some amps has

Usb works but no driver to change samplerate and to se what samplerate is used