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# Alert Sound Identifiers

Identifiers for alert sounds and alternatives to sounds, for use with the [`AudioServicesPlayAlertSound(_:)`](/documentation/AudioToolbox/AudioServicesPlayAlertSound(_:)) function.

## Topics

### Constants

[`var kSystemSoundID_Vibrate: SystemSoundID`](/documentation/AudioToolbox/kSystemSoundID_Vibrate)

On the iPhone, use this constant with the [`AudioServicesPlayAlertSound(_:)`](/documentation/AudioToolbox/AudioServicesPlayAlertSound(_:)) function to invoke a brief vibration. On the iPod touch, does nothing.

[`var kSystemSoundID_UserPreferredAlert: SystemSoundID`](/documentation/AudioToolbox/kSystemSoundID_UserPreferredAlert)

On the desktop, use this constant with the [`AudioServicesPlayAlertSound(_:)`](/documentation/AudioToolbox/AudioServicesPlayAlertSound(_:)) function to play the alert specified in the Sound preference pane.

[`var kSystemSoundID_FlashScreen: SystemSoundID`](/documentation/AudioToolbox/kSystemSoundID_FlashScreen)

On the desktop, use this constant with the [`AudioServicesPlayAlertSound(_:)`](/documentation/AudioToolbox/AudioServicesPlayAlertSound(_:)) function to display a flash of light on the screen.

[`var kUserPreferredAlert: SystemSoundID`](/documentation/AudioToolbox/kUserPreferredAlert)

A deprecated sound identifier.


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