---
title: bluetoothMicrophoneExtension
framework: avfaudio
role: symbol
role_heading: Instance Property
path: avfaudio/avaudiosessionportdescription/bluetoothmicrophoneextension
---

# bluetoothMicrophoneExtension

An optional port extension that describes capabilities relevant to Bluetooth microphone ports.

## Declaration

```swift
var bluetoothMicrophoneExtension: AVAudioSessionPortExtensionBluetoothMicrophone? { get }
```

## Discussion

Discussion This property is optional and will be nil for all ports for which this capability set doesn’t apply.

## See Also

### Accessing the port extension

- [AVAudioSessionPortExtensionBluetoothMicrophone](avfaudio/avaudiosessionportextensionbluetoothmicrophone.md)
- [AVAudioSessionCapability](avfaudio/avaudiosessioncapability.md)