4k monitor gaming monitor led monitor series acer predator xb1 screen size 28 inches max resolution 3 840 x 2 160 pixel lcd technology tn response time 1 ms aspect ratio 169 refresh rate 60 hz widescreen display settings srgb support number of displayport inputs 1 function colour calibration synchronisation g sync technology ergonomic properties pivotable height adjustable manufacturer specific features eyeprotect comfyview suitable for video gami