Just Mobile Gum Plus is a stylish portable backup battery for iPod, iPhone, iPad/ iPad 2 and USB-powered devices. Unlike most backup batteries, the Gum Plus is Apple-certified - its high-power USB output is enough to charge an iPhone to 90% in just one hour. And because it can store up to 4400mAh of power, the Gum Plus will recharge the iPhone up to four times before needing more juice. With its rounded aluminum case and five LED power indicators, the award-winning Gum Plus is a truly stylish way to pack a power up. Don"t leave home without it. With Just Mobile Pro Gum Plus, you can enjoy more music, more video, more talk, more games, more internet on your iPhone. With its standard USB charging port, it also charges your iPod, smartphone and other USB-powered devices.