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