Spec.:
1. Battery Type: li-ion
2. Capacity:6600mAh
3. Input:Micro USB
5V/1000mA(max)
4. Output: USB*2  5V/1500mA(max)
5.Dimension:98*54*19mm

Feature:
1)4 Blue inner LEDs indicates the Cap,
2)Charging indicate:The last LED will flick  when chargering the powerbank; and LEDs will turn on when it is full charged.
3)Press the button to display the battery cap,and Press the button for 3S to on or off USB output.