ENERGY STAR® is the government-backed symbol for energy efficiency, providing simple, credible, and unbiased information that consumers and businesses rely on to make well-informed decisions. ENERGY STAR is the simple choice for energy efficiency, making it easy for consumers and businesses to purchase products that save them money and protect the environment. ENERGY STAR RoHS stands for Restriction of Hazardous Substances. RoHS, also known as Directive 2002/95/EC, originated in the European Union and restricts the use of specific hazardous materials found in electrical and electronic products (known as EEE). All applicable products in the EU market after July 1, 2006 must pass RoHS compliance. The substances banned under RoHS are lead (Pb), mercury (Hg), cadmium (Cd), hexavalent chromium (CrVI), polybrominated biphenyls (PBB), polybrominated diphenyl ethers (PBDE), and four different phthalates (DEHP, BBP, BBP, DIBP). RoHS 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 DELL S Series 24 Monitor - S2421HN, 60.5 cm (23.8"), 1920 x 1080 pixels, Full HD, LCD, 4 ms, Black DELL S Series 24 Monitor - S2421HN. Display diagonal: 60.5 cm (23.8"), Display resolution: 1920 x 1080 pixels, HD type: Full HD, Display technology: LCD, Response time: 4 ms, Native aspect ratio: 16:9, Viewing angle, horizontal: 178°, Viewing angle, vertical: 178°. VESA mounting. Product colour: Black https://www.rtings.com/monitor/reviews/dell/s2421h The Dell S2421H is a basic 24 inch monitor with a 1080p panel and very few additional features. It's part of Dell's S Series of monitors, which are mainly entry-level to mid-range monitors designed for everyday use with a few advanced gaming features. The... Superb low input lag, FreeSync support, Good response time at the max refresh rate Terrible ergonomics, Mediocre contrast ratio, Small, low-resolution screen, No DisplayPort input https://www.monitornerds.com/dell-s2421h-review/ on AmazonThe Dell S2421H is an inexpensive monitor designed as a reliable daily driver for most uses, including for those who work from home. It doesn't have plenty of extra features, but it promises consistency and clear views of your content and do... Vibrant IPS Screen, Attractive Aesthetics, FreeSync/G-Sync Compatible, Speakers Included, Affordable, Tilt-Limited Stand, Limited Brightness, No DisplayPort The Dell S2421H is a great budget pick if you want a vibrant IPS screen with some extra refresh rate headroom and decent overall performance. It's not prosumer-grade, but users will appreciate the great gamut coverage and the good default accuracy. We lik...