Detail:  The 20000mAh Power Bank Comes In An Environmentally Friendly ABS Plastic Housing With A Textured Pattern Aimed At Improving Grip. The Plastic Makes For A Far Better Finish, As It Doesn't Make The Surface Of The Power Bank Nearly As Slippery As The Aluminum Design. The Casing Is Also Scratch-Resistant, And Can Withstand Heat Up To 90 Degrees Celsius. With An Overall Weight Of 338g.
Specification
Battery Type
Lithium-Ion Rechargeable Cell
Input Voltage
DC 5.0V 9.0V 12.0V
Output Voltage
DC 5.1V
Input Current
1500mA / 2000mA(TYP)
Output Current
2000mA(TYP) 3600mA (MAX)
Rated Capacity
3.75V/20000mAh(TYP)
Charging Time
18 Hrs With 5V/1A Plug And Standard Cable
7 Hrs With QC2.0 Technology Charger And Standard Cable
Remarks
Each Of The Two Ports Supports 5.1V/2.1A Output 
When Both Ports Are Used Simultaneously, Maximum Output Is 5.1V/3.6A
Load Detection
Auto-Detect The Plug-In And Plug-Out Of Devices
Safety
Supports Protection From Over-Voltage (Input And Output), Over-Current (Input And Output), Short Circuit, Over-Charge, Over-Discharge, And Battery Positive Temperature Coefficient (PTC).
Out Of Power Protection
Awake Once Pluged To The Charger
Discharging Temperature
Initial: -10~+50(TYP) 
Continuous: -20~+60(TYP)
 
Package Includes
1 X MI Power Bank 2 20000Mah
1 X Android Charging Cable