The STB class machine can use the Network Neighborhood or Samba mode to share the course video files of the computer (PC) or network attached storage device (NAS) through the local area network, including the conversion of DVD discs into video files. Specially designed for students to make up lessons, anti-theft and anti-copy videos will not leak out. The screen can be zoomed in during the playback, and the details can be seen at a glance. Skill-exclusive slow-motion control, decomposing the details of the teacher's movements. Seconds advance and seconds retreat. Born to solve problems.