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 MSI Pro MP341CQW E12, 34", 3440 x 1440 pixels, UltraWide Quad HD, 4 ms, White MSI Pro MP341CQW E12. Display diagonal: 34", Display resolution: 3440 x 1440 pixels, HD type: UltraWide Quad HD, Response time: 4 ms, Native aspect ratio: 21:9, Viewing angle, horizontal: 178°, Viewing angle, vertical: 178°. Built-in speaker(s). VESA mounting. Product color: White