> 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. # selectedAudioOutputDevice$ > Observable of the currently selected audio output device. ```ts get selectedAudioOutputDevice$(): Observable ``` Observable of the currently selected audio output device. ## selectedAudioOutputDevice ```ts get selectedAudioOutputDevice(): MediaDeviceInfo | null ``` Currently selected audio output device, or `null` if none. ## **Examples** ```ts client.selectedAudioOutputDevice$.subscribe((selectedAudioOutputDevice) => { console.log('selectedAudioOutputDevice:', selectedAudioOutputDevice); }); ``` > Observable of the currently selected audio output device.