Astro E1 Portable Charger External Battery Power Bank Charge your phone on the go. From ANKER, America's Leading USB Charging Brand • 10 million+ happy users and counting • Faster and safer charging with our advanced technology PowerIQ Exclusive to Anker. Intelligent high-speed charging for all your devices. Does not support Qualcomm Quick Charge. High Capacity Charge your Apple or Android smartphone one to two times while on the move. You can even charge a Nintendo Switch once. Incredibly Compact This thing is remarkably small. About the same size as a small candy bar, you simply will not find a more portable powerpack. Superior Quality We use only premium battery cells, together with advanced materials and cutting-edge technology, to ensure complete safety. 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 your original cable or a third-party certified one (such as MFi). • It is advised not to use in confined, poorly ventilated spaces (e.g. pockets). • Charging data is calculated in screen-off (standby) mode. • Compatible with the new 12 inch MacBook, 2015 (USB-C cable needed) 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.