Piezo buzzers are used for making beeps, tones and alerts. This one is small but loud! Drive it with 3-12V peak-to-peak square wave. To use, connect one pin to ground (either one) and the other pin to a square wave out from a timer or microcontroller. For the loudest tones, stay around 4 KHz, but works quite well from 2KHz to 10KHz.
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