Sensor signals an alarm on registering a low-frequency tone (impact sound), followed by a high-frequency tone (sound of broken glass). The sensor starts to analyze a high-frequency channel after receiving the low-frequency sound wave, caused by the impact.
Detection by the microphone the impact sound wave is indicated by LED blink. If during this time the high-frequency tone (sound of broken glass) is detected, the detector will trigger an alarm.
Mounting side view:
Declaration of Conformity CE