Excuse me, what should I do if the display device of Wan Hong learning machine Wang Xue is not online? Log in again. The display device controlled by Wang Xue of Wan Hong Learning Machine is not online. It is no problem to log in again. Wan Hong Company has a professional and pragmatic product technology R&D center, and has 160 R&D personnel in software and hardware, many of whom have graduate degrees or above, and can independently develop e-learning products of various specifications and technical grades, such as readers, learning computers and early education pens, so as to realize humanized R&D in the field of children's learning and memory.