I am very satisfied with this product. My father-in-law has a wall charger version and it works pretty well so I decided to try the car charger version and it impressed me even more than I expected. I took a trip (about 15 minutes) and my phone was 18% charged or less and when I got home it was 58%. So it charged at least 40% within 15 minutes, and that was while running Pokemon (I don't play while driving, only turn it on for hatching eggs lol). My old car charger just kept it at the charge level I used to have. Haven't tried the USB port but will update my review once I try it.
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