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What is this sensor? (Can detect the clap sound)

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alibarghi

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This sensor can detect a shocking sound such as clapping by a amplifier.
This is a photo of this sensor
_20190718_185215.JPG
_20190718_185139.JPG

What is this sensor?
 

An eletret microphone.
 

Thank you for your attention
This is not a electered microphone because it needs to be biased،but my circuit does not have any powers and is like a piezo drive
 

It looks quite similar to an ultrasonic piezo transducer. I doubt that it has much sensitivity in the audible sound range. Measuring the resonance frequency would be a first step to learn about its parameters.
 
Thank you very much
This is water proof ultrasonic sensor
 

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