... recognition, scene explanation and so on. Shenzhen Xuezhiyou Technology Co., Ltd. specialized in reading pen OEM, ODM, book ... , we have business with customers from South Korea, Japan, Middle East, Singapore, the United States, Britain, France, Russia, Indonesia ... on. Product Quality Assurance:Products of Shenzhen Xuezhiyou Technology Co., Ltd. have already passed national 3C certification, ISO9001 ...