Because most laptops do not have a nubmer keypad, and the only fast way to turn the microphone on and off is to use a button on the number keypad (the plus sign on the regular keyboard does not work).

Because most laptops do not have a nubmer keypad, and the only fast way to turn the microphone on and off is to use a button on the number keypad (the plus sign on the regular keyboard does not work).

Once you get going, trust me, you will want an efficient way to turn the mic on and off quickly without having to use the mouse.