... .Withstands severe environments 3.Stable, no-drif 2,4,6,10,16,32 points 32/42/52/55/65 ... touch activation force is requiredMinimum Touch Object2.5 mm X 2.5 mmVandal-proofNo break by 1-pound ... kV air / 8 kV contact discharges (EN61000-4-2,1995 :Level 4)ControllerIntegration inside touch panelAgency ApprovalsCE, FCC, RohsOperating ... Linux/ Dos / Windows 7/XP//Mac OS 2,4,6,10,16,32 points 32/42/52/55/65 ...