4k monitor gaming monitor led monitor series acer predator xb1 screen size 27 inches max resolution 3 840 x 2 160 pixel lcd technology ips response time 1 ms refresh rate 60 hz widescreen dot pitch 0 233 mm viewing angle 178178 display settings srgb support horizontal frequency range 30 209 khz vertical frequency range 24 144 hz number of hdmi inputs 1 number of displayport inputs 1 usb 30 ports 4 function colour calibration synchronisat