Public display touch screen monitor screen size 15 inches max resolution 1 024 x 768 pixel lcd technology tn response time 5 ms aspect ratio 54 contrast ratio typical 1 0001 brightness 350 cdm viewing angle 170160 horizontal frequency range 31 4 80 khz vertical frequency range 56 75 hz number of dvi inputs 1 number of vga inputs 1 usb 20 ports 1 function plug play ddc2b synchronisation separate sync convenience features multiling