*Maximum values depend on the laptop, operating system, power supply and simultaneous display arrangement. They are not universal promises.
| What matters |  Plugable UD-3900Z | Choose a dock above | Choose a dock above |
|---|
| Laptop connection | USB-A 3.0 or USB-C | — | — |
| Display technology | displaylink | — | — |
| Maximum displays* | 2 | — | — |
| Power to laptop (W)* | 0 | — | — |
| HDMI sockets | 2 | — | — |
| DisplayPort sockets | 0 | — | — |
| Display conditions | Two HDMI displays up to 1920 × 1200 | — | — |
| Mac requirements | DisplayLink software required | — | — |
| Windows requirements | Windows with DisplayLink software | — | — |
| Wired network | Gigabit Ethernet | — | — |
| USB peripherals | 2 USB 5Gbps; 4 USB 2.0 | — | — |
| Before buying | Does not charge the laptop HDCP content and demanding video workloads are poor fits | — | — |
| Current listing | Check on Amazon ↗ | | |