> 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. # selectedAudioInputDeviceConstraints > Media track constraints for the selected audio input device. ```ts get selectedAudioInputDeviceConstraints(): boolean | MediaTrackConstraints ``` Media track constraints for the selected audio input device. Returns `false` when disabled. ## **Examples** ```ts console.log(client.selectedAudioInputDeviceConstraints); ``` > Media track constraints for the selected audio input device.