| Color Category | Silver |
| Display Backlight Technology | WLED backlight |
| Display Image Brightness | 300 candela per square metre |
| Display Position Adjustments | Tilt , Height , Swivel |
| ENERGY STAR Certified | Yes |
| EPEAT Compliant | Yes |
| Input Signal | 2xHDMI, DisplayPort, USB-C |
| Model | U3421WE |
| Native Resolution | 3440 x 1440 |
| Product Line | Dell UltraSharp |
| Response Time | 5 millisecond |
| Screen Size | 34.1 inch |
| TCO Certified | Yes |
| V-Sync Rate at Max Res. | 60 hertz |
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