... .2. Optional touchscreen: 4-wire/5-wire Resistive, Infrared, SAW, Capacitive, with USB or RS232 touchscreen interface. ... cover industrial lcd monitor, open frame lcd monitor, touch monitor, commercial monitor, CCTV monitor, Panel PC, video ... CircuitUSB portsDefaultx4 USB(Max x6)Touch TypeTouchScreen TypeResistive(4-wire/5-wire)Optional Touch TypeSAW, IR, CapacitiveTouchScreen interfaceSerial (RS232) ...