Characteristics: The board has combination-type double-layer structure; the inner layer is the combination of electronic whiteboard and writing board and the outer layer is sliding writing board. The writing board can be pulled and pushed from side to side, which can protect the white board  when it is not used. The integrated design can realize simple conversion between writing board and electronic whiteboard , which is both time-saving and labor-saving, achieving the perfect combination of traditional teaching board and modern technology.