Vertex XtraLife 10000 mAh Black (XTRA10000BL) is a portable charger designed to charge the battery of mobile devices such as mobile phones, smartphones, MP3 players, and any other devices that have a USB charging function. It is compatible with iPhone and iPad (using a cable from the device's kit). With a capacity of 10000 mAh, it can charge your devices multiple times before needing to be recharged itself. The XtraLife 10000 mAh features two USB outputs, allowing you to charge two devices simultaneously.