The sound sensor module has a built-in capacitive electret microphone which is highly sensitive to sound. Sound waves cause the thin film of the electret to vibrate and then the capacitance changes, thus producing the corresponding changed voltage., so it can detect the sound intensity in ambient environment. You can adjust the sensitivity with by adjusting the Potentiometer.

This sound sensor is used to detect whether there’s sound surround or not, it cannot recognize the frequence or volum, please don’t use the module to collect sound signal.

Working voltage:DC3.5-5V
The output form Digital switch output (1 s and 0 s + v)
Equipped with a fixed bolt hole, convenient installation