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Don't you mean the Tap, rather than the Dot? The Tap is battery operated, the Dot requires 110V AC.
I too would like to know how well the Echo product works while in the vehicle, hooked to the wifi hotspot, of course.
Thanks, Eshrink. I did not know the Dot would run off of USB. For the price it sounds like a decent product and the review I read on it in general use was very good.