4K UHD (3840 x 2160) Native Resolution 8 ms Response Time 350 cd/m² Typical Brightness 4000:1 Contrast Ratio Host engaging business meetings with the Dell C5519Q 55" Class 4K UHD Conference Room Display. It outputs up to 350 cd/m² of brightness with a 4000:1 contrast ratio to help enhance visibility in bright environments. Its 8 ms response time help keeps your video smooth, even when viewing fast motion.