Represents a critical sound configuration that can be included in the aps dictionary of an APNs payload.




Optional critical

critical: boolean

The critical alert flag. Set to true to enable the critical alert.


name: string

The name of a sound file in the app's main bundle or in the Library/Sounds folder of the app's container directory. Specify the string "default" to play the system sound.

Optional volume

volume: number

The volume for the critical alert's sound. Must be a value between 0.0 (silent) and 1.0 (full volume).