Changzhou Qinglong Electronic Components Co.,Ltd is founded in May,1994, professionally engaged in developing and researching the electroacoustic parts which are mainly loudspeaker, Buzzer and ultrasonic Sensor . With a group of domestic topping experts who specialize in the fields of electroacoustics, electron, accurate mould, automatic machinery and high polymer materials, our company has its outstanding advantages. our research institute owns independent research and development ability and originality in the application of acoustics technol...