... axis 256 scratch-free,hand or glove hand operation both USB & RS232 port l SAW touch screen panel technical specificationTechnologySurface Acoustic Wave(SAW ... , Z-axis 256, not related with the sizes of the touch screen panelResponse time≤10msOperating temperature-10°C-70°COperating humidity10%-90 ... NT, MAC, LinuxAgency ApprovalUL, CE, FCC, RoHS , CB 15 inch touch screen