Specifications of Dell ST2421L. Display: 24 in, TN, W-LED, 1920 x 1080 pixels, Viewing angles (H/V): 170 ° / 160 °, Brightness: 250 cd/m², Static contrast: 1000 : 1, Dynamic contrast: 7000000 : 1, Refresh rate: 56 Hz - 76 Hz, Dimensions: 574.96 x 356.43 x 59.72 mm, Weight: 3.65 kg.