... dust.c. Power by USB.d. multi-colors choices for the board frame to satisfy local markets: Black, matt iron grey, champagne ... Recognition.9. Variety pen size, color, type for choices. Redo and undo function.10. main menu: save, save as, Multi-language options ... level students courses.14. Searchlight, camera, Screen cover.15. Background for teaching: black page, green page, letter paper, football field, ...