> ## Documentation Index
> Fetch the complete documentation index at: https://devdocs.xbox.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Knob

> Knob

# Knob

The styling attributes for a button like component that can be interacted with by the player.

## Properties

`background` - *object*, *optional*. Can either be a [color](/reference/system/touchadaptationkit/types/game-streaming-touch-color) or [image asset](/reference/system/touchadaptationkit/types/game-streaming-touch-asset).

`faceImage` - *object*, *optional*. Can either be an [icon](/reference/system/touchadaptationkit/types/game-streaming-touch-icon) or [image asset](/reference/system/touchadaptationkit/types/game-streaming-touch-asset).

`opacity` - *number*, *optional*. The opacity to be applied to the component. Default to 1.0 for all states but `disabled`.

[`stroke`](/reference/system/touchadaptationkit/types/game-streaming-touch-stroke) - *object*, *optional*. Styling instructions for [stroke](/reference/system/touchadaptationkit/types/game-streaming-touch-stroke) to be used on the outline of the component.

## Sample

```JSON theme={null}
{
    "knob": {
        "background" : {
            "type": "color",
            "value":  "#107C10"
        },
        "faceImage" : {
            "type": "icon",
            "value": "run"
        }
    },
}
```

## Remarks

The `knob` is a component of a more complex control (e.g., [joystick](/reference/system/touchadaptationkit/controls/game-streaming-touch-joystick),
[throttle](/reference/system/touchadaptationkit/controls/game-streaming-touch-throttle))
that can be interacted with by the player.

The default visual style of the `knob` is different per control.

## Related Controls

[Joystick](/reference/system/touchadaptationkit/controls/game-streaming-touch-joystick)\
[Throttle](/reference/system/touchadaptationkit/controls/game-streaming-touch-throttle)

## See also

[Touch Adaptation Kit Reference](/build/core-features/common/game-streaming/game-streaming-touch-touch-adaptation-kit-overview)