So I went to Brookstone today and purchased their "Global adapter with usb ports" product since most of the stuff I need to charge is USB based (ipad, camera, cell phone, etc)

While all I'd say nearly all of my stuff, using the supplied AC adapter, can convert the voltage, what I am wondering is what about when I am plugged directly into the USB ports with this thing- so no voltage convertor, just the plug adpater.

I'm assuming the stuff should be fine since I thought all USB cables used the same power levels...but I don't want to chance it without first seeking advice.

So...do I also need a power converter, or can I just use this the plug adapter?