... USB & RS232 port l SAW touch screen panel technical specificationTechnologySurface Acoustic Wave(SAW) Sizes8.4” to 26” Controller Interface USB and RS232Resolution4096*4096MaterialPure ... for 12V controller 90mA for 5V controllerResolution 4096*4096, Z-axis 256, not related with the sizes of the touch screen ... , MAC, LinuxAgency ApprovalUL, CE, FCC, RoHS , CB 32inch SAW touch screen 32inch touch panel