E means that the product is rated in its category in terms of energy efficiency. The Energy Labeling system is based on EU Regulation 2017/1369/EU. E LG 22MK400H, 55.9 cm (22"), 1920 x 1080 pixels, Full HD, LCD, 5 ms, Black LG 22MK400H. Display diagonal: 55.9 cm (22"), Display resolution: 1920 x 1080 pixels, HD type: Full HD, Display technology: LCD, Response time: 5 ms, Native aspect ratio: 16:9, Viewing angle, horizontal: 178°, Viewing angle, vertical: 178°. VESA mounting. Product colour: Black