F 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. F Hannspree HP 228 PJB, 21.5", 1920 x 1080 pixels, Full HD, LED, 5 ms, Black Hannspree HP 228 PJB. Display diagonal: 21.5", Display resolution: 1920 x 1080 pixels, HD type: Full HD, Display technology: LED, Response time: 5 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