***

id: 8655a70c-5349-45bb-b00d-a00851ad584a
title: createMicrophoneAnalyzer
slug: /js/reference/webrtc/create-microphone-analyzer
description: createMicrophoneAnalyzer function in the WebRTC namespace.
max-toc-depth: 3
----------------

### createMicrophoneAnalyzer

* `Const` **createMicrophoneAnalyzer**(`options`): `Promise<MicrophoneAnalyzer>`

Initializes a microphone analyzer. You can use a `MicrophoneAnalyzer` to track the input audio volume.

To stop the analyzer, call the `destroy()` method on the returned object.

The returned object emits the following events:

* `volumeChanged`: Instantaneous volume from 0 to 100.
* `destroyed`: The object has been destroyed. The parameter describes the reason: `null` (if you called `destroy()`), `"error"` (in case of errors), or `"disconnected"` (if the device was disconnected).

#### Parameters

<ParamField path="options" type="string | MediaStream | MediaTrackConstraints" required={true}>
  Either the id of the device to analyze, a [MediaStreamConstraints](https://developer.mozilla.org/en-US/docs/Web/API/MediaStreamConstraints) object, or a [MediaStream](https://developer.mozilla.org/en-US/docs/Web/API/MediaStream).
</ParamField>

#### Returns

`Promise<MicrophoneAnalyzer>`

#### Example

```js
const micAnalyzer = await createMicrophoneAnalyzer("device-id");

micAnalyzer.on("volumeChanged", (vol) => {
  console.log("Volume: ", vol);
});
micAnalyzer.on("destroyed", (reason) => {
  console.log("Microphone analyzer destroyed", reason);
});

micAnalyzer.destroy();
```