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# AudioServicesPlaySystemSound(_:)

Plays a system sound object.

```
func AudioServicesPlaySystemSound(_ inSystemSoundID: SystemSoundID)
```

## Parameters

`inSystemSoundID`

The system sound to play. Before using this function, call the [`AudioServicesCreateSystemSoundID(_:_:)`](/documentation/AudioToolbox/AudioServicesCreateSystemSoundID(_:_:)) function to obtain a system sound.

## Discussion

This function plays a short sound (30 seconds or less in duration). Because sound might play for several seconds, this function is executed asynchronously. To know when a sound has finished playing, call the [`AudioServicesAddSystemSoundCompletion(_:_:_:_:_:)`](/documentation/AudioToolbox/AudioServicesAddSystemSoundCompletion(_:_:_:_:_:)) function to register a callback function.

On some iOS devices, you can pass the [`kSystemSoundID_Vibrate`](/documentation/AudioToolbox/kSystemSoundID_Vibrate) constant to invoke vibration. On other iOS devices, calling this function with that constant does nothing.

Sound files that you play using this function must be:

- No longer than 30 seconds in duration
- In linear PCM or IMA4 (IMA/ADPCM) format
- Packaged in a `.caf`, `.aif`, or `.wav` file

In addition, when you use the `AudioServicesPlaySystemSound` function:

- Sounds play at the current system audio volume, with no programmatic volume control available
- Sounds play immediately
- Looping and stereo positioning are unavailable
- Simultaneous playback is unavailable: You can play only one sound at a time
- The sound is played locally on the device speakers; it does not use audio routing.

## See Also

[`AudioServicesAddSystemSoundCompletion(_:_:_:_:_:)`](/documentation/AudioToolbox/AudioServicesAddSystemSoundCompletion(_:_:_:_:_:))

Registers a callback function that is invoked when a specified system sound finishes playing.

[`AudioServicesCreateSystemSoundID(_:_:)`](/documentation/AudioToolbox/AudioServicesCreateSystemSoundID(_:_:))

Creates a system sound object.


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