ANKER: Amazon"s #1 Charging Brand • The highest average review rating of any charging brand. • One in three chargers sold on Amazon is from us. • Join the 6 million+ satisfied customers powered by Anker. 2nd Generation Astro E3 Portable Charger External Battery Power Bank Portable powerpack perfection. PowerIQ Detects your device. Delivers the fastest charge. Exclusive to Anker, PowerIQ amp-adjustment technology intelligently identifies your device to deliver its fastest possible charge. Ultra-High Capacity Charge an iPhone over four times, a large capacity phone like the Galaxy S5 two and a half times or most tablets at least once. Most Compact The size and feel of a smartphone. The E3 is unobtrusive, lightweight and the most compact among batteries of this capacity. Premium Performance Industry grade materials, premium circuitry and a 92% efficient battery cell (up to 10% above the industry average) ensure complete reliability. World Famous Warranty At Anker, we believe in our products. That"s why we back them all with an 18-month warranty and provide friendly, easy-to-reach support. For Optimal Use: • Use the included cable, your original cable or a third-party certified one (such as MFi). • Compatible with Apple and Android smartphones, tablets (including the Nexus 7) and other USB-charged devices except for the iPod nano, iPod Classic, HP TouchPad, Dell Venue 11 Pro, Asus tablets and some GPS and Bluetooth devices. • Do not try to recharge the Astro E3 while it"s charging a device, as this may reduce the battery"s lifespan.