The device seems very picky about how the USB connector plugs into the cigarette lighter power adapter. Once it works, don't confuse it. Also, I use it with the Incipio iPhone 7 Plus Wireless Charging Protective Case, so it's probably less efficient than the iPhone's built-in Qi charger. It doesn't seem to charge or drain when I use navigation like Waze, Google Maps, or Apple Maps while on the charger.
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