Description: Piezo elements come in handy when you need to detect vibration or a knock. You can use these for tap or knock sensors pretty easily by reading the voltage on the output. They can also be used for a very small audio transducer such as a buzzer.
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This piezo element needs some mass to make a loud noise or detect vibrations.
After I did that, it has a nice high pitched frequency range. It can also detect footsteps throughout my entire house with the standard Arduino ADC and no amplification. How awesome is that?
Nothing to add to the previous review - put some mass on (not a lot though) and it will detect slightest vibrations. Make sure it suits your application though.