This module acts as a switch with sound as input. When a sound is detected above the set sensitivity, this module briefly signals. This module can be used as a blow sensor or a trigger when too much noise is made. 
Properties:-  Voltage: 4V - 6V 
 -  Adjustable sensitivity 
 -  Output: Digital 
 -  Output LED (on when output = 1) 
 -  Comparator chip: LM393 
 
Interface:-  VCC: 4V - 6V 
 -  GND: GND 
 -  DO: digital output (0 and 1)