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 Samsung QE50Q67BAUXTK, 50", 3840 x 2160 pixels, QLED, Smart TV, Wi-Fi, Gray Samsung QE50Q67BAUXTK. Display diagonal: 50", Display resolution: 3840 x 2160 pixels, HD type: 4K Ultra HD, Display technology: QLED, Screen shape: Flat. Smart TV. Native aspect ratio: 16:9. Wi-Fi, Ethernet LAN. Product color: Gray