EPCTEK&reg;New Gray flat shape 3000mAh Cell Phone Portable External Battery Power Bank Backup Charger Pack for iPhone 5, 4S, 4, 3GS, Samsung Galaxy Note & Tablets, S4, S3, S2, Nexus Fit for your iPhone 4S / 4G / 3GS/Samsung 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; InputDC5V/1A ; Output:DC5V/1A