武进市江南讯响器厂成立于1988年，是一家专业开发。生产。销售蜂鸣器（电磁式&压电式） ，薄型喇叭和驻极体传声器等股份制企业。
Jiangnan acoustic factory was established in 1988 . it is a joint stock company which develops produce and manages buzzer ( magnet buzzer & piezo buzzer ) , mylar speaker and transducer etc.
深圳旭升电子有限公司成立于二00二年二月，现已成为国内技术领先、质量最佳、产量最大、服务最优的驻极体传声器专业生产厂家之一。
Shenzhen Xusheng Electronic co. , limited established in Feb. of 2002, now it is one of leading electret microphone producer with high technology, best quality, biggest production in the China.
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