Dongguan Zeruntai Silicon Technology Co. Ltd. and Dongguan Tongrun Electronic Technology Co., Ltd. are professional silicon technology product manufacturers and service factories integrating R amp& D design, production and sales. They are located in Dongguan Guangdong Province, an international manufacturing city between Shenzhen and Guangzhou.br Ltd. is subordinate to the foreign trade Sales Department of our factory which is mainly responsible for the global trade sales between Zherentai factory and Tongrun factory. In order to give customers a better experience, our team is responsible for docking customer service.