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If you are always on the road and outside without access to a power supply, you would definitely need the
Griffin PowerJolt Car Charger. It sports a low-profile design, is very easy to use, and gives you a versatile way of charging your iPhone. You just plug in the PowerJolt car charger to your car's cigarette lighter or a 12V accessory socket, and your iPhone will get its much deserved power charge. It has an amber/green charging status light to tell you when you're iPhone is fully charged and has a detachable dock connector to USB Type A cable that you can use to connect your iPhone to your Mac or PC. (Price: $19.95)