Differences in composition:

Buzzer is divided into two kinds of piezoelectric buzzer and electromagnetic buzzer, the biggest difference between the piezoelectric buzzer and buzzer is a shell, a shell.

Electromagnetic is more traditional, by the principle of electro-magnetic sound, piezoelectric is the latest, is a combination of materials into a pronunciation, there are positive and negative, positive and negative power can be directly audible, but the disadvantage is that the sound is more small. The buzz piece is a piezoelectric ceramic original, the two are not the same.