In Windows 11/10, the default audio output device is the device that Windows uses to play sound – this can be speakers, headphones, Bluetooth headset, or other audio devices connected or built ...

To look for the number of available connected devices, just click on the Volume symbol on the taskbar. Now click on the connected device name. It will enlarge the list of available connected devices.

Professor Hawking used an input device controlled by his cheek movements to choose the words he wanted to use. A special output device turned those words into electronic speech that people could hear.