... scene explanation and so on. Shenzhen Xuezhiyou Technology Co., Ltd. specialized in reading pen OEM, ODM, book ... For export sales, we have business with customers from South Korea, Japan, Middle East, Singapore, the United States, ... Britain, France, Russia, Indonesia, Turkey, Thailand, Malaysia and so on. Product Quality Assurance:Products of Shenzhen Xuezhiyou Technology Co., Ltd ...