aluminum shell, LED display, and rubber patched buttons. Nice design, simple operation; Long life and strong anti-interference. Zhangjiagang Yanan Automobile Appliances Co., Ltd is the main supplier of Kinglong and Yutong buses who are the two best buses in ChinaYanan bus stops speaker.It is professionally made Manual/Auto MP3 voice stops device for buses. Adopted aluminum shell, LED display, and ...