Everything has limits, and since you don't know what is going on exactly in this device, and more importantly, how many JOULES of energy it can shove down your USB port's throat, you are simply talking out your ass.
Everything has been described pretty informatively, and I just love when random people like yourself claim that someone is talking out of their ass, possibly knowing exactly what I know or less. I find you amuzing, but please don't take offense, there is so many other things in life that could potentially do that. Not worth it.
"Probably the best operating system in the world is the [operating system] made for the PDP-11 by Bell Laboratories." - Ted Nelson, October 1977