12.1" Openframe LCD SAW touchmonitor Both RS232 and USB interface FCC,CE,CCC,RoHS certificated Dust-proof Metal Plate ... -pin VGAFrequency(H/V) 30~80KHz / 60~75HzPower Supply Type: External brickInput (line) voltage: 100-240 VAC, 50-60 HzOutput voltage ... System InterfaceUSB and RS232CertificatesETL ,FCC,CE,RoHS Openframe touch LCD monitor with 12.1"SAW Touch screen