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 E Series E2222HS, 54.5 cm (21.4"), 1920 x 1080 像素, Full HD, LED, 10 毫秒, 黑色 戴尔 E Series E2222HS. 显示器尺寸（对角长）: 54.5 cm (21.4"), 显示器分辨率: 1920 x 1080 像素, HD 类型: Full HD, 显示技术: LED, 响应时间: 10 毫秒, 原机长宽比: 16:9, 视角，水平: 178°, 视角，垂直: 178°. 内置扬声器. VESA 安装支架, 高度调整. 产品色彩: 黑色