ToggleKeys
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ToggleKeys is a feature of Microsoft Windows. It is an accessibility function which is designed for people who have vision impairment or cognitive disabilities. When ToggleKeys is turned on, computer will provide sound cues when the locking keys (⇪ Caps Lock, Num Lock, or Scroll Lock) are pressed. A high sound plays when the keys are switched on and a low sound plays when they are switched off.
History
Microsoft introduced ToggleKeys to their Windows operating system with Windows 95. The feature is available in all latter versions of Windows.
Enabling
Press Num Lock key for 5 seconds. This feature can also be turned on and off via the Accessibility icon in the Windows Control Panel.
See also