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 LG 48GQ900-B, 121.9 cm (48"), 3840 x 2160 pixels, 4K Ultra HD, 0.1 ms, Black LG 48GQ900-B. Display diagonal: 121.9 cm (48"), Display resolution: 3840 x 2160 pixels, HD type: 4K Ultra HD, Response time: 0.1 ms, Native aspect ratio: 16:9, Viewing angle, horizontal: 178°, Viewing angle, vertical: 178°. Built-in USB hub. VESA mounting. Product colour: Black https://www.digitaltrends.com/computing/lg-ultragear-48-inch-oled-48gq900-b-review/ The introduction of large, OLED gaming monitors begs an interesting question: What makes a gaming monitor, a monitor? Compared to the multitude of similar-sized OLED TVs out there, it's not always easy to tell. LG's UltraGear 48-inch OLED gaming monitor... Fantastic OLED quality, Useful desktop remote, FreeSync and G-Sync support, Bright, vibrant bias lighting Doesn't support dynamic HDR metadata, Pixel density can be a problem