G 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. G Sharp PN-HW551, Digital signage flat panel, 139.7 cm (55"), TFT, 3840 x 2160 pixels Sharp PN-HW551. Product design: Digital signage flat panel. Display diagonal: 139.7 cm (55"), Display technology: TFT, Display resolution: 3840 x 2160 pixels, Display brightness: 350 cd/m². Product colour: Black