Solved: HP Dreamcolor Z27x- USB 3.0 ports - what are they used for? - HP Support Community - 7059610
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Plugable USB 3.0 Universal Laptop Docking Station Dual Monitor for Windows and Mac, USB 3.0 or USB-C, (Dual Video: HDMI and HDMI/DVI/VGA, Gigabit Ethernet, Audio, 6 USB Ports) - Walmart.com
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