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Orders & After-sale Service


WhatsApp: (00) +86 150-1949-9375

Headquarters:15/F,Hing Yip Commercial Centre,272-284 Des Voeux Road Central, Central, Hong Kong,999077


CHN Office: 4/F,Bowen Building, No. 17, Xinxing Street, Zhangmutou Town, Dongguan, Guangdong,523618


USA Office: 15650 Salt Lake Ave. City of Industry CA 91745


Head Company:Hongkong Valsun Technology Limited | Business Register Number:2263704


Branch Company:Dongguan Haisheng Network Technology Limited | Business Register Number:441900006544872



China Guangzhou Plenty Bicycle Limited

Tongtu Bicycle (Guangzhou) Limited

Shenzhen Dongboshi Technology Limited

Shenzhen DBS Technology Limited

Wuyi Jinyue Engine Science and Technology Limited


Service Hours: United States Central Standard Time (CST) working days from 7:00 PM - 4:00 AM  (except holidays)


If you have any questions before purchasing, please contact us via email, we will deal with your problem as soon as possible.

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Any comments and suggestions are welcome. Please feel free to contact Vivi friendly customer service staff and help Vivi improve the quality of service. Thank you!Send an email to

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