StarTech.com - DK30ADD USB 3.0 Dual Monitor Docking Station for Mac & Windows with HDMI, VGA/DVI & 6 USB 3.0 Ports
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StarTech.com DK30ADD USB 3.0 Dual Monitor Docking Station / Mac & Windows / USB to HDMI / USB to VGA or DVI / Port Replicator / 6 x USB 3.0
Expand laptop display with dual monitor docking station
This dual monitor USB 3.0 docking station for Mac and Windows expands the display capabilities of your laptop with flexible video output: HDMI and DVI or HDMI and VGA (with DVI to VGA adapter included)
The port replicator turns your laptop into a workstation w/ six USB (Type-A) ports and Gigabit Ethernet port plus 3.5 mm audio headphone port
Two of the USB 3.0 ports are always-on fast-charge ports
- Maximum Number of Displays Supported2Number of DisplayPort Outputs (Total)0
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StarTech.com DK30ADD USB 3.0 Dual Monitor Docking Station / Mac & Windows / USB to HDMI / USB to VGA or DVI / Port Replicator / 6 x USB 3.0

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The Plugable UD-3900Z USB 3.0 and USB-C docking station is a reliable USB docking station designed for standardized workstation deployments across Windows, macOS, and ChromeOS environments. As a universal docking station, it enables consistent desk setups across mixed device fleets, expanding laptops and desktops with dual monitors, wired networking, audio, and USB peripherals through a single connection. This USB docking station dual monitor solution supports two HDMI displays up to 1920x1200 @ 60Hz and uses DisplayLink technology to enable extended or mirrored desktops on compatible Windows and ChromeOS systems, as well as on Apple Silicon MacBooks including M1, M2, M3, M4, M5, and MacBook Neo models, even on systems that are typically limited to a single native external display. The UD-3900Z provides 10 expansion ports, including 2 HDMI outputs, 2 USB 3.0 ports for high-speed devices, 4 USB 2.0 ports for keyboards, mice, and receivers, Gigabit Ethernet for stable wired network connectivity, and 3.5mm audio input/output. Both USB-C and USB-A host cables are included, allowing this USB A docking station to support legacy systems while also functioning as a modern USB C docking station. The compact vertical design helps reduce cable clutter and fits easily between monitors, making it well suited for hot-desking and shared workspace environments. This dock is HDMI-only and does not support DisplayPort. HDCP is not supported, so encrypted content such as Netflix, Hulu, or Blu-ray will not play. Designed for business applications rather than GPU-intensive workloads, it is not recommended for gaming or full-screen video playback. The included 24W external power supply powers connected accessories but does not charge the host laptop. In the box: UD-3900Z dock (7.5” x 2.8” x 5.3”), 24W power adapter with US wall plug (100-240V, 50/60Hz, 1.5m / 5ft), USB-A (USB 3.0) to USB-B cable (0.9m / 2.95 ft), USB-C to USB-B host cable (2.9m / 9.5 ft), and quick-install guide.
| Pros for StarTech.com - DK30ADD USB 3.0 Dual Monitor Docking Station for Mac & Windows with HDMI, VGA/DVI & 6 USB 3.0 Ports | |||
|---|---|---|---|
| There were no pros for this product— | Overall Performance, Connectivity, Port Selection, Portability, Heat Dissipation | Overall Performance, Connectivity, HDMI, Ease of use, Design | There were no pros for this product— |
| Cons for StarTech.com - DK30ADD USB 3.0 Dual Monitor Docking Station for Mac & Windows with HDMI, VGA/DVI & 6 USB 3.0 Ports | |||
| There were no cons for this product— | Compatibility, Cord Length | Compatibility | There were no cons for this product— |
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