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 戴尔 P2421, 61.2 cm (24.1"), 1920 x 1200 像素, WUXGA, LCD, 8 毫秒, 黑色 戴尔 P2421. 顯示器尺寸(對角長): 61.2 cm (24.1"), 顯示器解析度: 1920 x 1200 像素, HD 類型: WUXGA, 顯示器技術: LCD, 回應時間: 8 毫秒, 原機長寬比: 16:10, 水平可視角: 178°, 垂直可視角: 178°. 內建 USB 集線器, USB 集線器版本: 2.0 / 3.2 Gen 1 (3.1 Gen 1). VESA 安裝支架, 高度調節. 產品色彩: 黑色