Applicable to all types of indoor and outdoor schools, teaching, various types of organizations, of assembly, auction houses, meeting rooms, guided tours, gymnastics demonstrations, a dance studio, group activities, visits to explain, and exhibitions of advertising, morning body movement, exhibition , shopping malls commodity promotion.

*Protect teacher's voice,improve the quality of education.

*With good voice ,50-100 square meters space can hear clear.

* With endureable battery,easy change and Ecnomic&Pro-environment.

*Made in highly strength ABS material,strong & sprawing.