Solved: HP Dreamcolor Z27x- USB 3.0 ports - what are they used for? - HP Support Community - 7059610
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Monitor Stand Riser, Dreamsoule 4-Port USB 3.0 Hub Tempered Glass Monitor stand, Quick Charge 5Gbps High-speed Data Transfer, Laptop Stand Desk Tabletop Organizer Keyboard Tray with USB cable for Laptop, PC, MacBook(White) :
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