Mophie's 'Juice Pack Air' is an external battery created to recharge iPhone 4 phones.
The battery sits in a sleek protective hard-shell casing and even has an opening to insert the USB cord to charge the case while it is charging the phone. The case is ultra sleek and not bulky, as the name would suggest. For people who cannot live without their iPhone, this battery is a lifesaver in dying moments -- it provides twice the battery life of the iPhone alone.
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