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 AOC AG346UCD/75, 86.4 cm (34"), 3440 x 1440 pixels, 0.03 ms, Black, Grey AOC AG346UCD/75. Display diagonal: 86.4 cm (34"), Display resolution: 3440 x 1440 pixels, Response time: 0.03 ms, Native aspect ratio: 21:9, Viewing angle, horizontal: 178°, Viewing angle, vertical: 178°. Built-in speaker(s). Built-in USB hub. VESA mounting, Height adjustment. Product colour: Black, Grey