how to check KY-038 Sound Sensor

hello everybody, i am trying to make sound reactive led, but i think my KY-038 Sound Sensor is not work, how can i check is it work? i read that i must set potenciometer, but how i do not know. please help me

That's a 10-turn pot so try cranking it several turns clockwise and if that doesn't do anything try several turns counterclockwise.

If that doesn't work, post your code and tell us how you've got it connected.

The KY-038 Sound Sensor is just a pure crap.

It uses a comparator on the unamplified and dc biased microphone signal, an absolute non-sense.