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So on one end you plug in the HDMI, and the other end you need a female->male cable to power the USB? Just asking for clarification.

I think that's the idea, although you could do it either way:

-Plug it directly into the USB port and use cable+adapter to connect to HDMI.

-Plug it directly into the HDMI port and use cable+adapter to connect to USB.

Actually, a third way would be to use cables on both ends, but that just seems kind of silly.