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23mm diam. 7mm height. 4kHz resonant freq. 30Vpp max driving signal voltage. 90dB at 10cm. 30mm fixing centres for 2mm screws.
A Piezoelectric speaker or buzzer is a loudspeaker that uses the piezoelectric effect for generating sound. The initial mechanical motion is created by applying a voltage to a piezoelectric material, and this motion is typically converted into audible sound using diaphragms and resonators.