Using Ethernet technology, teachers can easily transfer HD video to an intermediate monitor installed next to the student.Those that simulate blurred images become clearer, more visible, and because video and audio can be transmitted without delay, PC classrooms can be used like an audio-visual room and extend the use of the classroom.You can choose the composition used in the classroom. If you use it as a “current selector” in the active learning classroom, you will make the presentation go smoothly and support smooth classroom operations. It can also be used as a "video distribution device" in a regular lecture room. The device does not require a cooling fan. We consider its voice and failure rate in class. 4K UHD 60 Hz can transmit video and audio for digital video. It also supports HDCP and can also transmit Blu-ray video. Efficient education using HD video and sound through simple operations.