Robotjoy Power Bank (5V 3.5A Dual Outputs - 20,000mAh High Capacity External Battery Pack) 20,000mAh High Capacity Battery 5V/3.5A Dual USB Outputs (for Charging your portable Devices) Micro-USB Input Port at 5V/2.5A (for Charging Power Bank) LED Charging Indicator Long Lasting Polymer Lithium Battery