Those are self resonating. They will buzz at 2300hz when 5 volts is applied. Look for "transducer".
Something like this
https://www.ebay.com/itm/AT-12-Piezo...gAAOSwZd1Vewuj
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Re: FREQOUT 4mhz
Those are self resonating. They will buzz at 2300hz when 5 volts is applied. Look for "transducer".
Something like this
https://www.ebay.com/itm/AT-12-Piezo...gAAOSwZd1Vewuj
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