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*Maximum values depend on the laptop, operating system, power supply and simultaneous display arrangement. They are not universal promises. “Not confirmed” means current sources did not establish the value; it does not mean none.

Published specifications and buying checks for the selected docking stations
What mattersPlugable UD-3900PDZChoose a dock aboveChoose a dock above
Laptop connectionUSB-C with DisplayPort Alt Mode and PD——
Display technologyUSB graphics / DisplayLink——
Maximum displays*3 displays maximum——
Power to laptop*100W published host power——
HDMI sockets3——
DisplayPort socketsNone——
Display conditions1 × 4K30 native Alt Mode; 2 × 1080p60 DisplayLink——
Mac requirementsDisplayLink installation required; Alt Mode needed for the native output——
Windows requirementsWindows with DisplayLink software; native channel also requires DP Alt Mode——
Wired networkGigabit Ethernet——
USB peripherals6 USB-A, 5Gbps——
Before buyingNot three 4K outputs; DisplayLink outputs are unsuitable for protected streaming and demanding gaming——
Current listingCheck on Amazon