| Color Category | Black , Silver |
| Display Backlight Technology | LED backlight |
| Display Image Brightness | 300 candela per square metre |
| Display Position Adjustments | Height , Tilt , Swivel |
| ENERGY STAR Certified | Yes |
| EPEAT Compliant | Yes |
| Input Signal | 2xHDMI, DisplayPort, Thunderbolt 3 |
| Integrated System | 3-year warranty |
| Model | U4021QW |
| Native Resolution | 5120 x 2160 |
| Product Line | Dell UltraSharp |
| Response Time | 5 millisecond |
| Screen Size | 40 inch |
| TCO Certified | Yes |
| V-Sync Rate at Max Res. | 60 hertz |
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