How to change brightness level up down programmatically

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I use this PowerShell code to change volume level up down

# 174 down | 175 up
(New-Object -Com WScript.Shell).SendKeys([char]175)

I want to do the same with screen brightness up down.
I do this by pressing FN + F11/ F12 with Keyboard.

Refer to ss64, I didn’t find the FN key.

How can I do it with a script? change brightness level up down.

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