... .Withstands severe environments 3.Stable, no-drif 2,4,6,10,16,32 points 32/42/52/55/65 inch multi touch ... minimum touch activation force is requiredMinimum Touch Object2.5 mm X 2.5 mmVandal-proofNo break by 1-pound steel ball ... Linux/ Dos / Windows 7/XP//Mac OS 2,4,6,10,16,32 points 32/42/52/55/65 inch multi touch ...