Prob from the manufacturers website or maybe in your lappy manual. are you worried that you may not have enought power from usb to Run one of these???
the lappy is getting on a bit now, its about 5 years old, i cant find any info about the usb ports power output on the pachard bell website but heres the spec: http://support.packardbell.com/it/item/index.php?pn=P920400006&t=1409
its always run on the main power supply, the battery is u/s
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