The piezo buzzer main structure has a piezo element and built-in oscillation source. Its advantages are simple structure; it is suitable for designs that require high sound pressure level (SPL) and low current consumption. However, a larger size is needed if a higher sound pressure level is required. Several models are available in many tones for applications such as alarm, anti-theft, and reversing. In addition, various terminals are available, such as SMT, pin, and wire.