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 Dahua Technology LM32-P301A, 31.5", 2560 x 1440 pixels, 2K Ultra HD, LCD, 4 ms, Black, Red Dahua Technology LM32-P301A. Display diagonal: 31.5", Display resolution: 2560 x 1440 pixels, HD type: 2K Ultra HD, Display technology: LCD, Response time: 4 ms, Native aspect ratio: 16:9, Viewing angle, horizontal: 178°, Viewing angle, vertical: 178°. Built-in USB hub. Height adjustment. Product color: Black, Red