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Question: what are the black and white arrows for?

hello. I have a one step flash which is approx 20 years old but looks brand new and was barely used. in the front, right below the lens, there is a black arrow facing left and a white arrow facing right. There is a toggle thing you can slide either all the way to the left or the right and a white line int he middle where the setting is right now. What is this for? How doe sthis work? thank you