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This review is from: Griffin PowerJolt Dual In-Car Charger Compatible with iPhone 3/3GS/4/4S and iPod (1 Amp x 2 USB) - Black (Wireless Phone Accessory)
After trying numerous chargers for my iPhone 3GS and subsequently iPhone 4 I was getting a bit sick of the "device not supported" error message!
No such problems with this little device.
Very small and tidy. As a non smoker I can leave the plug in the socket and close the compartment fully, only plugging in the cable when required.
Haven't tried charging 2 iPhones yet but no reason to expect problems, and this wasn't an important feature for me. (How often do you get 2 iphones in desperate need of a charge at the same time?)
I am so pleased I've bought another one for my wife's car.