![I got this controller with a used ps pro at GameStop, it had a button on the back that turns on a green light on the lightbar, anyone have any idea as I got this controller with a used ps pro at GameStop, it had a button on the back that turns on a green light on the lightbar, anyone have any idea as](https://external-preview.redd.it/EzgNnoZOuzT2wuOB5mybyNbZ9IlFMvavMWWM2fq4CUI.jpg?width=640&crop=smart&auto=webp&s=f6619fb644a2b448f7a99b45835eae599bba6d9b)
I got this controller with a used ps pro at GameStop, it had a button on the back that turns on a green light on the lightbar, anyone have any idea as
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