IMPRINTED - The Emergency Keychain 1,800 mAh Power Bank is a rechargeable lithium polymer Grade A battery device powerful enough to charge smartphones, MP3 players and more. The 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 such as Android smartphones from Samsung®, Motorola®, HTC®, Nokia®, and others. It also includes split metal key ring. USB to Micro USB charging cable is included. Input: 5V/800mA; Output: 5V/1000mA.