A sound element refers to an element that vibrates to generate sound. Or generate electrical signal from Sound such as Microphone, Speaker, Electromagnetic buzzer and piezoelectric buzzer. 

Piezo Buzzer, Electromagnetic Buzzer, Acoustic Transducers.

Website: https://www.cre-soundbuzzer.com/

Piezo Buzzer, Electromagnetic Buzzer, Acoustic Transducers, Sirens, speakers and Microphones.

Website: https://www.kingstate.com.tw/