The product features are as follows: 1. Drawing and writing can choose a variety of handwriting writing such as soft pen, hard pen, highlighter pen, writing brush, etc., and can change the handwriting size and handwriting color, especially the screen is infinitely enlarged and infinitely written. 2. Multimedia display software can import PPT, WORD, JPG, video and other media formats, and can directly take screenshots and annotations to increase the richness of multimedia presentation. 3. Support online video conference and record and broadcast the whole process. The external camera, microphone and other equipment of this system, as long as the participants are connected to the network, the ends of the earth are like communicating around them, and the meeting process and online operation can be recorded into files, saved and played back. 4. A variety of conference software can be selected. There are mainly electronic photo sign-in software and corporate culture wall software. The two softwares extend the system functions. The electronic sign-in software can take photos and sign, guide guest seats, draw prizes for guests, print photos and other functions. The corporate culture wall software uses a variety of different display effects to provide new explanation methods for corporate publicity, product introduction, etc., and prompt the company's image.