Step 2: Next, it’s just a matter of holding the Option (⌥) key while clicking the menu bar volume icon. Once you do so, you’ll see a listing of all of your Mac’s input and output devices.

In Device Properties, next to the device icon, you can enter the new name ... it may lead to absolute zero output or input sound. Shubham is a PHP Developer, who is skilled in PHP, DOM, Angular ...

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.