High efficiency rate, charges an iPhone 10 times, or comes with enough power for 7 or more charges to most other large capacity smart phone like Galaxy S4 in a compact.2.1A output charges your devices more rapidly. Ultra-thin and lightweight design,slimmer and stronger features,what's better than a high-capacity battery that slides into your pocket on-the-go,so you can power up into time and make the most of your day. Unique HIGH INPUT design, use a 2.1A adapter for fastest charging time, twice as fast than 1A input.With the least amount of time fully charging your device. Dual-port and intelligent circuit chip,constructed with built-in intelligent microchips which provide multiple protection,dual-port USB output charge two devices simultaneous with full-speed charges. Package contents: Poweradd™ external battery, micro USB cable, user manual.