... tapping recognition, scene explanation and so on. Shenzhen Xuezhiyou Technology Co., Ltd. specialized in reading pen OEM, ODM, ... so on. Product Quality Assurance:Products of Shenzhen Xuezhiyou Technology Co., Ltd. have already passed national 3C certification, ... -84688448Add.: 6thfloor building 8thJinghua industrial park, Liangbai road, Pinghu, Longgang district, Shenzhen, ChinaElectronic paper book1.6- ...