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Reviews around usb port (5.00 of 5)
POTEK 500W Power Inverter/Car Inverter DC 12V to AC 110V Dual AC Charging Port and 2A USB Ports for Laptop, Smart Phone
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The USB port is handy, though to be fair, I use adapters in the car for charging my portable devices.
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But, in an older vehicle with limited outlets, if you are using your only one for this, the extra USB port should be handy
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