The mophie juice pack air gives you the one-two punch of a rechargeable external battery with a hard-shell case. Now your iPhone 4/4s can be protected from life's hard knocks, with the added bonus of more time to talk to your friends, stay online and play games. The battery inside the form-fitted case boosts your battery life by almost double, and the pass-through USB means you can charge and sync without taking off the case. Track how much battery life remains with the LED lights on the juice pack's bottom, or switch to standby mode for even more power.
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