Piezo Buzzer 5-12V DC

• Two wires, red & black.
Polarity matters: black=ground
• Apply an oscillating voltage to
make a noise
• The buzzer case supports the
piezo element and has
resonant cavity for sound

You can get at the piezo element pretty easily.
Be careful not to crack the white disc that is the actual piezoOnly take it out of its case to use it as a sensor.