Yu Si

Beijing Ruiji Tongda Technology Co., Ltd. engages in the research, development, design, and sale of electromechanical products and measurement and control products. It offers computer system services, basic and application software services, software development and consulting, and research and experimental development of engineering and technology. The company was founded on August 28, 2015 and is headquartered in Beijing, China.

Beijing Iwhere Netcom Science & Technology Co., Ltd. engages in the development, promotion, and transfer of technology; software development; and the provision of internet information, technical consultation, and technical services. It also engages in data processing; the integration of computer network systems; design of computer animation; organization of exhibition events; design, production, and launch of advertisements; sale of electronic products, mechanical equipment, computers, as well as software and auxiliary equipment; and provision of computer system services, basic and application software services; conference services; corporate planning and management services; as well as economic, trade, and business management consultation services. The company was founded on June 1, 2015 and is headquartered in Beijing, China.

Tonghuijiashi (Beijing) Information Technology Co., Ltd. engages in the provision of display application services. Its products include smart interactive liquid crystal display (LCD) whiteboard, ultra narrow side LCD splicing, professional LCD, intelligent interactive conference system, small pitch light-emitting diode (LED), Data loss prevention (DLP) projection display, NEC business projection, and black crystal smart Nano blackboard. The company was founded on July 31, 2008 and is headquartered in Beijing, China.