C 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. C Sharp MultiSync E244F, 24", 1920 x 1080 pixels, Full HD, LCD, 6 ms, Black Sharp MultiSync E244F. Display diagonal: 24", Display resolution: 1920 x 1080 pixels, HD type: Full HD, Display technology: LCD, Response time: 6 ms, Native aspect ratio: 16:9, Viewing angle, horizontal: 178°, Viewing angle, vertical: 178°. Built-in speaker(s). VESA mounting, Height adjustment. Product color: Black