Piezoelectric buzzer uses piezoelectric material, that is, when the piezoelectric material is deformed by external force, the piezoelectric material will generate electric charge. Similarly, the piezoelectric material will deform when it is electrified.
Electromagnetic buzzer, mainly using the characteristics of magnetic field generated by electrified conductor, uses a fixed permanent magnet and electrified conductor to generate magnetic force to push the drum membrane fixed on the coil.
Due to the different pronunciation principles of the two kinds of buzzers, the piezoelectric structure is simple and durable, but the tone is single and the tone color difference is single, which is suitable for alarm devices and other equipment. And electromagnetic type because of good timbre, so it is mostly used in voice, music and other equipment.