The 2200 mAh rechargeable lithium ion Grade A battery is enough to charge smartphones, MP3 players and more. Reusable power bank charges via USB cable (included) which can recharge the battery backup or be used to charge up devices with a micro-USB input like Android smartphones from Samsung®, Motorola®, HTC®, Nokia®, and others. Green LED indicator light turns on when device is fully charged. Input: 5V/500mA. Output: 5V/1000mA.