The sensor signals an alarm if it registers a low-frequency signal (impact sound) and a high-frequency signal (broken glass sound)A low-frequency sound wave caused by an impact causes the sensor to start analyzing the high-frequency channel
The recording of the sound of a shock wave by the microphone is indicated by the flashing of the LEDIf a high-frequency sound appears at this time, i.e. the sound of broken glass, the sensor triggers an alarm