28-inch screen, 4K UHD resolution (3840 x 2160) for stunningly realistic visuals Lightning-fast 1ms response time and Adaptive-Sync technology for incredibly smooth and fast gaming visuals. DisplayPort 1.2, and HDMI port (v 2.0) for 4K UHD playback; and two USB 3.0 ports for fast charging of your mobile devices. ASUS exclusive Ultra-Low Blue Light, Flicker-Free, GamePlus, and GameVisual technology, offering tactical assistance at your command. The monitor is working and has no issues. The buyer has the right to test it. Selling to the highest bidder. Brand: Asus