Shenzhen Sayin Smart Technology Co.，Ltd.
ADD:Floor 2nd, Building 1, Guanlan High-tech Industrial Park, Road, Guanlan Street, Longgang District, Shenzhen , China
Website：www.isayin.com
E-mail: info@isayin.com
Contact name：Jane Chang
Cellphone/WhatsApp/Skype/Wechat:+8613538059325
