ViewSonic 27-inch 4K Ultra HD Monitor (VP27684K) - Resolution: UHD 3840 x 2160, Contrast Ratio: 1300:1 (Typ), 910:1 (Min), Aspect Ratio: 16:9, Response Time: 5ms (GTG w/OD), Brightness: 350 cd/m² (Typ)/280 cd/m²(min), Connectivity: 1 x Input: DisplayPort 1.2a, 1 x Mini DP 1.2a, 2 x HDMI 2.0, Output: 1 x 3.5mm Mini Phone Jack Audio out (Earphone), USB: 1 x Upstream: Type B, 4 x Downstream: Type A, Compatibility: PC: PC Compatibles (3840x2160 HDMI/DisplayPort Non-Interlaced), Mac: Power Mac (up to 3840x2160 HDMI/DisplayPort), Wall Mountable: VESA: 100mm x 100mm