It compatible with almost All smart phones and other device charged via USB port. *Capacity: from 2600mAh to 20000mAh Li-Polymer *Input Voltage: DC 5.0V *Input Current: 1000mA (Max) *Duo USB output, charge 2 devices simultaneously *Output Voltage (Port A): 5.0V *Output Current (Port A): 1000mA *Output Voltage (Port B): 5.0V *Output Current (Port B): 2100mA *IC Protection for charging / overcharge / short circuit / discharge *Circle Time:≥500 Times *LED indication for Battery Status *Size: 135x70x22 mm