Ceramic speaker 20mm - with wire - 5 pcs

This ceramic (piezoelectric) speaker has a diameter of 20 mm with soldered leads of 80 mm. The speaker works on the basis of the piezo-electric effect and bends when voltage is applied to it, by doing this at a certain frequency, tones or even music can be played. This effect also works in reverse, when the speaker picks up vibration, voltage is generated, so the speaker can also be used as a microphone.