The piezoelectric speaker is an acoustic output device that uses the piezoelectric property to create sound. It operates by applying a 5V DC voltage to a thin piezoelectric element, which expands and contracts periodically, producing sound waves.

The process is based on the ability of materials to convert electrical energy into mechanical deformation and vice versa. It is suitable for use in electronic projects, alert systems, and DIY applications that require sound. With a compact design, it offers reliable and easy-to-use operation.