Dell 28 inch Ultra HD 4K LED Monitor S2817Q, 16:9 Aspect Ratio, 2ms Response Time, TN Panel, 2 x HDMI, 1 x DisplayPort, 1 x Mini DisplayPort, 300 cd/m2, Built-in Speaker (Black) TN (Twisted Nematic) Panel HDMI / DisplayPort / Mini-DisplayPort / Speaker 4K UHD 3840 x 2160 Screen Resolution Typical 1,000:1 Contrast Ratio Built-in dual 9W integrated speakers envelope you in clear, rich sound.