KZ
Producers/Manufacturers:

Shenzhen Yuanze Electronics Co., Ltd./  深圳市原泽电子有限公司

Official Websites/Webstores:

http://www.kzacoustics.com/

https://kzearphone.1688.com/

https://shop1420770527419.1688.com/

https://kzyingyin.tmall.com/

https://taoctt.taobao.com/

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