Whether you have the iPhone 5 or it's successor, the iPhone 5S, keeping your battery going for a full day can be a challenge. Even the iPhone 5 or 5S's long-lasting battery, it turns out, is quickly overcome by the needs of such rapid data transmission. But fear not! With the iPhone 5S / 5 External Battery Case (2200 mAh), you and LTE can together jet onward into the future, unencumbered. This remarkably thin, ergonomic, durable, and stylish case packs hours of extra life for your iPhone. Utilizing a breakthrough Lithium Polymer battery, the iPhone 5S / 5 External Battery Case charges simultaneously with standard charging and data transmission and can be turned on and off for maximum battery conservation.