1.Run it with just your fingertip. 2.Aluminum, Anti-glare 3.Certificates:CE, FCC,CCC,Rohs 4.size:69',78,'82' Technical ParameterWorking PrincipleInfrared inductionHardware PlatformPC,laptopOperation SystemWin98/ Me/2000/XP/2003Transmission InterfaceUSB / RS-232Resolution4096×4096Positioning Accuracy≤0.5mmCursor Speed240d/sRespond timeFirst spot(click) 25 msConsecutive spot(write) 8 msData ...