... -based training Advantage --Multitouch,support 2-32 points--Size(32”-200”),Max length:90 meter,customation is available)--Rapid response speed ... --Power supply mode:USB--System:windows 7,vista,XP,Mac OS,Linux 2/Dual points 40 inch IR multi touch screen ... overlay kit Size(32"-200"),Max length:90 meter,customation is available) Etwotouch