Bertha acoustic sound electro-acoustic experts outstanding senior electronics engineer for many years in Japan , China&＃039;s first touch logic Walkman developers - Yuzhi saying Mr. leading research and development , with the German GOULD the fen root of Telefunken ( So far, more than 100 years of history , is the world&＃039;s leading television , wireless microphone system , audio equipment manufacturers ) to work together to promote the world&＃039;s top acoustic products , and global sales