MicroUSB = Battery Charge In
Power Out = External USB power Supply Only
HUB 1/2/3/4 = USB Hub, connecting with external USB devices
Hub-in USB = to Rasbperry Pi USB Port
Other Functions
- LED flash light, active by pressing backside button SW2
- You may need to prepare a high watts LED to use this, because it is not a very common function for this board.