Mouse Sensitivity In-Game Settings

Hello, I have made my Game, But now i want to make settings menu in Game and want to control my FPS player mouse senstivity by slider i have set the slider already but how can i get axis to my player mouse senstivity and attach it to that slider.

public Slider sensitivitySlider;
public float mouseSensitivity = 150;
public float Sensitivity;

    private void Update()
        mouseSensitivity = mouseSensitivity * sensitivitySlider.value;
        //The lower the value of the slider, the lower the mouse sensitivity in game

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