... . Two point touch Gesture control: screen moveable, previous page, next page, select, rotate, zoom in/out, eraser.2. ... after-class playback)12. Different courses special tools: ruler, protractor, compasses etc.(customize local tools)13. Local Resources: different type ... camera, Screen cover.15. Background for teaching: black page, green page, letter paper, football field, basketball field, Staves for ...