DOUBLE YOUR BATTERY LIFE: Internal 3000 mAh rechargeable lithium-ion battery can charge a dead iPhone, Android, or other USB powered device up to two times, at any place at any time. ULTIMATE 2-IN-1 CHARGER: Simply fold-in the prongs to convert this charger from a USB wall charger to a high capacity portable battery pack. LED BATTERY INDICATOR: Portable battery pack has 4 LED indicator lights that allow you to always know exactly how much juice is left. It can charge one USB at a time.