Plastic housing, DC 5V rated voltage, 2 terminals, convenient for connecting.
They have good characters like small cubage, low wastage and high voice pressure.
Size: 9 x 11.8 mm (L x D) / 0.35 x 0.46 inch
Rated voltage: 5V
piezo is an electronic device that generates a voltage when it’s physically deformed by a vibration, sound wave, or mechanical strain. Similarly, when you put a voltage across a piezo, it vibrates and creates a tone. Piezos can be used both to play tones and to detect tones.