To use ClickMonitorDDC, your monitor needs to support the DDC / CI command interface.

Its name is for Display Data Channel, communication protocol that monitors use to communicate with PC graphics chip. There are plenty of apps that can adjust these hardware-level settings, but the most powerful we tested was ClickMonitorDDC. As useful as they are, Flux and other night Shift features only adjust color temperature of the picture, not the actual brightness of the screen. However, by turning to third-party app, you can adjust these settings from an icon in the taskbar, or even with quick keyboard shortcut. These can often be tweak with a set of clunky menus using buttons hidden on the side of the display. Most PC monitors come with a host of adjustments like brightness, contrast, and color settings.