Voice calls require approximately 10 bps, and images require data rates of approximately 500 kbps. A simple way to check is to run a video such as YouTube or Weibo. If the screen is displayed normally, it is possible to use video communication software such as Skype. It is also a good idea to install software on your desktop or mobile device to verify network speed. Before the video class, be sure to check the network speed and start the class at a stable speed.
EL Korean supports its app to be used on both mobile devices and desktop. Mobile devices can be used anywhere, anytime; so teacher and student can use. However if textbook is used, large-screened PC would be better.