---
title: outputVolume
framework: avfaudio
role: symbol
role_heading: Instance Property
path: avfaudio/avaudiosession/outputvolume
---

# outputVolume

The systemwide output volume set by the user.

## Declaration

```swift
var outputVolume: Float { get }
```

## Discussion

Discussion This property returns a value in the range 0.0 to 1.0, with 0.0 representing the minimum volume, and 1.0 representing the maximum volume. Only the user can directly set the system volume. Provide a volume control in your app, using MPVolumeView, to provide the interface to adjust the system volume. You can observe changes to the value of this property by using Key-value observing.