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Doing so displays the following prompt to enable Toggle Keys if the feature is not enabled already. While you can enable the Toggle Keys option using the Settings application, you may also enable it by holding down the Num Lock key for five seconds straight. The on-sound has a higher pitch, the off-sound a lower one so that you can determine the state of the key from the sound alone. Windows 10 plays two different sounds depending on the state the key enters. When you enable Toggle Keys, Windows will play a sound whenever you activate the Caps Lock, Num Lock or Scroll Lock key on the keyboard.
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Windows 10 comes with a new, somewhat hidden, option to enable a feature that Microsoft calls Toggle Keys.
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