> 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.

# ConstraintFallbackEvent

> Event emitted when getUserMedia falls back to looser constraints.

Event emitted when getUserMedia falls back to looser constraints.

## **Properties**

**`actualDevice`** `MediaDeviceInfo | null` — required

The device that the browser actually provided. See [`MediaDeviceInfo`](https://developer.mozilla.org/en-US/docs/Web/API/MediaDeviceInfo).

---

**`fallbackLevel`** `exact | preferred | default` — required

The constraint level that succeeded.

---

**`kind`** `audioinput | videoinput` — required

The kind of input device.

---

**`requestedDevice`** `MediaDeviceInfo | null` — required

The device that was originally requested. See [`MediaDeviceInfo`](https://developer.mozilla.org/en-US/docs/Web/API/MediaDeviceInfo).

---

> Event emitted when getUserMedia falls back to looser constraints.