Instructional Material: Display Surfaces
Here in this picture is an improvised "Smart board"
SMART Boards Why are they so easy to use?: https://www.youtube.com/watch?v=0U05WeXPGlk
Display surfaces materials are reliable, because in case of failure of electricity or of internet connection, there wouldn't be a problem, and teachers will still be able to continue with the class.
Smartboards on the other hand, provides a new technology for the children to use. With these, children can easily manipulate drawings, texts, etc.