I bought it for my wife so we could use her ipod on long car trips. We recently bought a car with an aux input. The usb outlet works as promised and the ipod went from being fully discharged to fully charged while driving. Be aware that while the unit is advertised as having 175W output, the manual states that a car cigarette lighter can only support 130W. Apparently in an effort to claim the 175 W output the package includes alligator clips specifically designed to clip onto the terminals of a car battery. Not clear under what circumstances this would be useful! I've recently seen device only a single usb output, without 110 V AC power. If you don't need the 110 output this would be a less complex/expensive solution.
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