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# CPNowPlayingPlaybackRateButton

A button for cycling through the available playback rates.

```
@MainActor class CPNowPlayingPlaybackRateButton
```

## Overview

`CPNowPlayingPlaybackRateButton` is a concrete subclass of [`CPNowPlayingButton`](/documentation/CarPlay/CPNowPlayingButton). Use the button’s handler to invoke your existing functionality for cycling through playback rates, using the same <doc://com.apple.documentation/documentation/MediaPlayer/MPChangePlaybackRateCommand> that you provide to <doc://com.apple.documentation/documentation/MediaPlayer/MPRemoteCommandCenter>.

CarPlay uses `MPRemoteCommandCenter` to observe changes to the playback rate and updates the button’s appearance accordingly.

---

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