Brand: Dell Screen Size: 23.8 inches Monitor Type: LED Model Number: S2421HN Are batteries needed to power the product or is this product a battery: Yes Is this a Dangerous Good or a Hazardous Material, Substance or Waste that is regulated for transportation, storage, and/or disposal: No External Product ID Type: EAN-13 Device Type LED edge light system Panel Type IPS Aspect Ratio 16: 9 1920 x 1080- at- 75 Hz Pixel Pitch 0.2745 x 0.2745 mm Brightness 250 cd/m2 (typical) Contrast Ratio 1000: 1 (Typical) Response Time 4 ms gray to gray in.