EPCTEK&reg Portable High Capacity External Battery Power Bank Backup Charger for iPhone 4S / 4G / 3GSSamsung Galaxy S4 / S3, Nokia and other smart phones (5200mAh, Blue) 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: DC 5V 1000mAh,Output: DC 5V 1000mAh; Charge the power bank via standard USB or AC adapter (not included)