The mechanical buzzer with a built-in oscillation source uses a coil to generate a magnetic field to drive parts to strike the diaphragm, thus producing a loud low-frequency sound (400Hz) and vibration effect. The input voltage is available from 1.5 to 24 Vdc, making it suitable for products that require low-frequency sound and vibration effects. For example, mouse repellers, animal repellers, and products with vibration feedback have widely used mechanical buzzers.