Just start up to maximize the screen brightness.
Please use it when you want to temporarily increase the brightness, such as the situation where letters are difficult to see outdoors or checking the photos taken.
Once started, it will return to the previous brightness by starting again.
It is a simple application that has no advertisement and troublesome setting screen.
Please set "Permit changing of system settings" displayed at the first startup to ON. By turning ON, this application will be able to change the brightness.