How many USB ports does the HP EliteDisplay E231 have?
The HP EliteDisplay E231 features an integrated USB 2.0 hub with two downstream ports and one upstream port, for a total of three USB ports. This built-in hub allows you to connect USB devices directly to the monitor. (Page 2)
From the official HP Elitedisplay E231 23 Inch Led Backlit Monitor manual, page 2
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