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The Just Mobile Gum Pro Battery Pack (Black) is a portable backup battery for your Apple iPod, iPhone and other USB-powered devices. With a full-size USB output of 1,000 mA, the Gum Pro is powerful enough to charge an iPhone to 90% in just one hour -- and with 4,400 mAh of power, it can recharge the iPhone and other devices up to four times before it needs more juice. Three LEDs indicate how much power is left, while an on/off switch ensures the Gum Pro won't discharge accidentally. Meanwhile, you can keep browsing and app-tapping without worrying about a drained battery!