Product Video Link: https://www.youtube.com/watch?v=VOxx9y_CgCI 

Appearance description:
OTG switch
Output USB port (1A) x 2
Input micro USB port x 1
Micro USB retractable reel cable indicator
Power indicator - external
Function button
LED light
Battery capacitor indicator
Micro USB retractable reel cable x 1
Output USB port (2.1A) x 1
Input DC socket x 1
LED light spiral arm

Integrate functions:
HUB
Power bank
Rapid charger
OTG
LED light (flash light)
Rack
Joint function
Replaceable battery
Book clip