A buzzer can distinguish the sound generation principle as magnetic, piezo, and mechanical, all of which are equipped with an internal driving circuit (Active) and can output a fixed single frequency sound using direct current voltage (Vdc). The buzzer is plug and play (PNP) design, which allows customers to simplify their circuit design. It provides a variety of terminals such as pin, wire, SMT, and solder-pad available for customers' different assembly requirements.