---
title: sound
framework: usernotifications
role: symbol
role_heading: Instance Property
path: usernotifications/unmutablenotificationcontent/sound
---

# sound

The sound that plays when the system delivers the notification.

## Declaration

```swift
@NSCopying var sound: UNNotificationSound? { get set }
```

## Discussion

Discussion Use this property to specify the sound that you want played when the notification arrives. If your app isn’t authorized to play sounds for notifications, the system ignores this property. For information on how to specify sounds for your notifications, see UNNotificationSound.

## See Also

### Integrating with the system

- [interruptionLevel](usernotifications/unmutablenotificationcontent/interruptionlevel.md)
- [UNNotificationInterruptionLevel](usernotifications/unnotificationinterruptionlevel.md)
- [relevanceScore](usernotifications/unmutablenotificationcontent/relevancescore.md)
- [filterCriteria](usernotifications/unmutablenotificationcontent/filtercriteria.md)