D 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. D EIZO FlexScan EV2456, 24", 1920 x 1200 pixels EIZO FlexScan EV2456. Display diagonal: 24", Display resolution: 1920 x 1200 pixels, Native aspect ratio: 16:10 https://www.monitornerds.com/eizo-ev2456-review/ The Eizo EV2456 is a revamped 16:10 IPS monitor designed for the business market where the extra vertical space on the screen comes in handy. Eizo has always been synonymous with quality and reliability, providing consumers with high-grade display... The Eizo EV2456 offers strong imaging qualities and reliability that you can certainly get on an enterprise model. The screen's default output is excellent, and it doesn't need calibration, but there is still some room if you want to minimize deviations f...