... 9. Variety pen size, color, type for choices. Redo and undo function.10. main menu: save, save as, Multi-language options, print, ... writing or annotation all the operations on the board and save for real-time or after-class playback)12. Different courses ... level students courses.14. Searchlight, camera, Screen cover.15. Background for teaching: black page, green page, letter paper, football field, ...