> Fetch clean Markdown by appending `.md` to any page URL under https://signalwire.com/docs or requesting it with the HTTP header `Accept: text/markdown`. The root index at https://signalwire.com/docs/llms.txt lists the available documentation indexes.

# getDeviceCapabilities

> Returns the capabilities of a media device.

```ts
getDeviceCapabilities(deviceInfo): Promise<MediaTrackCapabilities | null>
```

Returns the capabilities of a media device.

## **Parameters**

**`deviceInfo`** `MediaDeviceInfo` — required

The device to query. See [`MediaDeviceInfo`](https://developer.mozilla.org/en-US/docs/Web/API/MediaDeviceInfo).

---

## **Returns**

`Promise<MediaTrackCapabilities | null>`

The device capabilities, or `null` if unavailable.

## **Examples**

```ts
await client.getDeviceCapabilities(deviceInfo);
```

> Returns the capabilities of a media device.