# cast.[framework](https://developers.google.com/cast/docs/reference/web_receiver/cast.framework).[system](https://developers.google.com/cast/docs/reference/web_receiver/cast.framework.system).SystemVolumeChangedEvent

class static

An event dispatched by [cast.framework.CastReceiverContext](https://developers.google.com/cast/docs/reference/web_receiver/cast.framework.CastReceiverContext) when the
system volume changes.

## Constructor

### SystemVolumeChangedEvent

new
SystemVolumeChangedEvent(volume)

| #### Parameter ||
|---|---|
| volume | [cast.framework.system.SystemVolumeData](https://developers.google.com/cast/docs/reference/web_receiver/cast.framework.system.SystemVolumeData) The system volume data. Value must not be null. |

Extends
:   [cast.framework.system.Event](https://developers.google.com/cast/docs/reference/web_receiver/cast.framework.system.Event)

## Properties

### data

non-null [cast.framework.system.SystemVolumeData](https://developers.google.com/cast/docs/reference/web_receiver/cast.framework.system.SystemVolumeData)

The system volume data.

### type

non-null [cast.framework.system.EventType](https://developers.google.com/cast/docs/reference/web_receiver/cast.framework.system#.EventType)

The event type.

Inherited from
:   [cast.framework.system.Event#type](https://developers.google.com/cast/docs/reference/web_receiver/cast.framework.system.Event#type)