ENERGY STAR® is the government-backed symbol for energy efficiency, providing simple, credible, and unbiased information that consumers and businesses rely on to make well-informed decisions. ENERGY STAR is the simple choice for energy efficiency, making it easy for consumers and businesses to purchase products that save them money and protect the environment. ENERGY STAR DELL P2011H, 50.8 cm (20"), 1600 x 900 pixels, 5 ms, Black DELL P2011H. Display diagonal: 50.8 cm (20"), Display resolution: 1600 x 900 pixels, Response time: 5 ms, Native aspect ratio: 16:9, Viewing angle, horizontal: 170°, Viewing angle, vertical: 160°. USB hub version: 2.0. Product colour: Black