Number 1: Indicates the fan RGB cables which can be chained.
Number 2: Indicates the end of the fan RGB cable chain being plugged in to the connector located on the front I/O panel (right side of the case in the top furthest to the front).
Right image: Indicates the button on the I/O-panel and displays how you change the lighting mode and how to change colors.
The maximum load for the controller is 2.0A.