KDAYI 2500mAh Credit-Card-Size Ultra-Slim 1A USB Fast Charging Portable External Battery Charger Pack with Built-In Micro-USB Cable - White Capacity: 2500mAh, Li-polymer, Built-in micro USB output, not need to bring separated cable. Ultra Slim Design for Easy CarryingSuper slim, OK to put in to wallet. It applies to Samsung, Apple 4/.4s, Apple 5/5s and other. For iPhones requires Micro USB to iPhone Lightning Converter. Package includes: External Battery, Micro USB wire, iPhone5 converter.