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 microphone recording the sound of a shock wave is indicated by the flashing of the LEDHigh-frequency channel analysis takes 4 secondsIf a high-frequency sound occurs during this time, i.e. the sound of broken glass, the sensor triggers an alarm