Lenovo LI2821 28-Inch 4K LED-Lit Monitor 4K UHD Display - Enjoy movies, games, and photos with 4x more detail (3840 x 2160) than a Full HD monitor or TV. Web Conferencing - Chat with friends with built-in 2 MP webcam, dual-array microphone and JBL-designed speakers. Lenovo Split Screen - Watch visuals from 2 different inputs at the same time for ultimate multitasking. Panel Size - 28" 4K Ultra HD (3840 x 2160) LED