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 50UM662H4LC, 127 cm (50"), 3840 x 2160 pixels, 4K Ultra HD, Smart TV, Wi-Fi, Grey LG 50UM662H4LC. Display diagonal: 127 cm (50"), Display resolution: 3840 x 2160 pixels, HD type: 4K Ultra HD, Screen shape: Flat. Smart TV. Display brightness: 330 cd/m², Native aspect ratio: 16:9. Digital signal format system: DVB-C, DVB-S2, DVB-T2. Wi-Fi, Ethernet LAN. Product colour: Grey