The Zing 2,200 mAh Power Bank w/ Digital Display is a 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 devices with a micro-USB input like Android smartphones from Samsung®, Motorola®, HTC®, Nokia®, and others. The LED digital power indicator will confirm exactly how much charge remains within the power bank. Input 5V/800mA. Output 5V/1000mA.