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 CU34G4Z/75, 86.4 cm (34"), 3440 x 1440 pixels, 1 ms, Black, Red AOC CU34G4Z/75. Display diagonal: 86.4 cm (34"), Display resolution: 3440 x 1440 pixels, Response time: 1 ms, Native aspect ratio: 21:9, Viewing angle, horizontal: 178°, Viewing angle, vertical: 178°. Built-in USB hub. VESA mounting, Height adjustment. Product colour: Black, Red