USTOP External USB Battery Charger High Capacity Power Bank for iPhone ipad samsung (12000mAh, Black) Fit for your iPhone 4S / 4G / 3GSSamsung Galaxy S4 / S3, Nokia and other smart phones; Compact, portable, Sleek, stylish and compact design; Easily fits into your bag to provide instant power; PERFECT for trainroad trips, or whenever you need to charge your mobile devices wherever you are. High quality Lithium-ion battery ensures reliability; Input: 5V-1A(Max),Output: 5V-2.1A(Max)5V-1A(Mini)