It has the built-in modes sets of adjusted values and 'hotkeys' (Ctrl-Alt - ...) to select one from them, and to change simple values, and to turn on the screensaver or to turn off the monitor.
Remarks. It's not for notebooks... If the program does'n work... - Install native driver for your monitor... Try to change in Monitor.ini : TrySetLight = True (to enable brightness changing), TryContrast = True (to enable contrast changing).
i has very small size, can be used as portable one, has an icon on taskbar, and provide very simple managment of selected monotor's brightness and contrast.