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 MEDION LIFE X14317, 109.2 cm (43"), 3840 x 2160 pixels, LED, Smart TV, Wi-Fi, Black MEDION LIFE X14317. Display diagonal: 109.2 cm (43"), Display resolution: 3840 x 2160 pixels, HD type: 4K Ultra HD, Display technology: LED, Screen shape: Flat. Smart TV. Display brightness: 320 cd/m², Contrast ratio (typical): 5000:1, Native aspect ratio: 16:9. Digital signal format system: DVB-C, DVB-S2, DVB-T2. Wi-Fi, Ethernet LAN. Product colour: Black