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 Armada 25 FHD Gaming Monitor, 24.5", 1920 x 1080 pixels, Full HD, LCD, 1 ms, Black Armada 25 FHD Gaming Monitor. Display diagonal: 24.5", Display resolution: 1920 x 1080 pixels, HD type: Full HD, Display technology: LCD, Response time: 1 ms, Native aspect ratio: 16:9, Viewing angle, horizontal: 178°, Viewing angle, vertical: 178°. VESA mounting. Product color: Black