This sound sensor can identify the presence of sound. The sensor sensitivity can be adjusted by potentiometer.

The sound sensor module work like that: when the intensity of the sound  can not reach set threshold, the OUT pin will output high level  5 volt  ( open ). When the intensity of the sound reach more than the set threshold, the  OUT pin will output low level  (2.5 volt).

•  supply voltage range: 3.3V - 5.3V
•  Comparator IC: LM393
• Mic type  : capacitive
• Output:  Analog  ( normally open) - change from 5 volt to 2.5 volt when detect sound.
• Size: 39 x 17 x 10 mm