***

id: 84f94563-e6ae-4c33-85ae-4ee4bd79d72d
title: addDevice
slug: /js/reference/video/room-session/add-device
description: addDevice method for the RoomSession class.
max-toc-depth: 3
----------------

### 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

<ParamField path="opts" type="object">
  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.
</ParamField>

<Indent>
  <ParamField path="audio" type="boolean | MediaTrackConstraints" required={false}>
    Audio constraints.
  </ParamField>

  <ParamField path="autoJoin" type="boolean" required={false}>
    Whether the device should automatically join the room. Default: `true`.
  </ParamField>

  <ParamField path="video" type="boolean | MediaTrackConstraints" required={false}>
    Video constraints.
  </ParamField>
</Indent>

#### 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/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 });
```