Apologies, I've been working with too many 2.5" portable HDD's with extra power USB power connectors.
So to be USB powered .. this monitor requires AT LEAST 3x USB connections, and possibly more?
It's a good thing motherboards come with upto 14x USB2 ports, eh?
And it seems a bit of stretch that .. if you can power a PC .. you can't buy a $2 double adapter to supply the monitor .. or spend $10 you get a Y cable.
I have a 3yr old 20" dell monitor rated at 34W (Average) sitting beside me ... so getting an 18.5" down to 7.5W (minimum) is really just a bit of natural progression, given that LED's now get about 4-6x the light compared to 2yrs ago, when they started installing them, and can now be used in lieu of cold cathode fluorescents.
I'm actually not particularly impressed.
Seems like a gimmick.