> For a complete index of all SignalWire documentation pages, fetch https://signalwire.com/docs/llms.txt

# addDevice

> addDevice method for the RoomSession class.

### addDevice

* **addDevice**(`opts`): `Promise<RoomSessionDevice>` - See [RoomSessionDevice documentation](/docs/browser-sdk/v3/js/reference/video/room-session-device) for more details.

Adds a device to the room. Using this method, a user can stream multiple sources at the same time. If you need to add a camera device or a microphone device, you can alternatively use the more specific methods [addCamera](/docs/browser-sdk/v3/js/reference/video/room-session/add-camera) and [addMicrophone](/docs/browser-sdk/v3/js/reference/video/room-session/add-microphone).

#### Parameters

Specify the constraints for the device. In addition, you can add the `autoJoin` key to specify whether the device should immediately join the room or joining will be performed manually later.

Audio constraints.

Whether the device should automatically join the room. Default: `true`.

Video constraints.

#### Returns

`Promise<RoomSessionDevice>` - See [RoomSessionDevice documentation](/docs/browser-sdk/v3/js/reference/video/room-session-device) for more details.

#### Permissions

* `room.self.additional_source`

You need to specify the permissions when [creating the Video Room Token](/docs/apis/rest/video/room-tokens/create-room-token) on the server side.

#### Example

Adding any of the microphone devices to the room (duplicate streams are possible):

```javascript
await roomSession.addDevice({ audio: true });
```