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

# sound

The sound that plays when the system delivers the notification.

## Declaration

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

## Discussion

Discussion Notifications can play a default sound or a custom sound. For information on how to specify custom sounds for your notifications, see UNNotificationSound.

## See Also

### Reading system configuration

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