When using it to watch tv the audio trails the picture by about 0.5 seconds. Very annoying. The sound quality is good so if listening to music or podcasts is what you are doing it’s fine.
Such a tiny and lightweight thing but it does exactly what I expected. I have plugged into my TV with the AUX cable and paired with my Bose Bluetooth headphones very easily - Same with plug from my old Amplifier headphone jack. No drop outs or lag experienced with image to voice playback.