It lacks a headphone or nothing to say

UTILIZATION

I use it with an acoustic instrument from the plugs and CAUTION:

if the guitar repisse singing into the microphone (which happens ds it is a bit strong), it is DTECT as a microphone signal and ARTeFAC harmonization are audible. So choose a song that isolates a microphone up to the source produced by the instrument, otherwise you will have unpleasant surprises.

share a very easy to use (learn with video tutorials on the internet) and harmonies quality

SOUND QUALITY

It would probably make more sense to have four singers, but I did not and that little box did a great job.

OVERALL OPINION

Trs well but be careful to choose the microphone if you use a singing instrument.