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. Anker 2nd Generation Astro External Battery Powering over two million people to date. Detects your device. Delivers the fastest charge. Exclusive to Anker, PowerIQ amp-adjustment technology intelligently identifies your device to deliver its fastest possible charge. Packed with power, charge an iPhone 5s three times, a large capacity phone like the Galaxy S5 over one and a half times or an iPad mini once. Superior Quality We use only the finest quality LG cells, together with the most advanced materials and cutting-edge technology, to ensure complete safety. Ultra Compact As small as a candy bar. Now upgraded with higher density cells and efficiency 10% above most other brands to give you 6% more power. 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, LG G2, Asus and some GPS and Bluetooth devices.