Provides light to read if there is no suitable light or it is too bright.
Allows you to change the color and the brightness of the light.
Settings are accessed outside of the main app so that changes are not being made by accident.

Personal note:
I was using a different app to have light while reading and was annoyed by the ads being displayed.
I then created my own app and thought I also could share it with others.
Some things just do not need to make any money...