Multi Touch Screen(2-32 points) 1. drag, draw-line, rotate, zoom in/out 2.Withstands ... 3.Stable, no-drif 2,4,6,10,16,32 points 32/42/52/55/65 inch multi touch screen overlay ... 7/XP//Mac OS 2,4,6,10,16,32 points 32/42/52/55/65 inch multi touch screen overlay ...