Cleankeys CK4 Manuel De L'utilisateur page 6

Special keys and functions
In addition to the standard set of characters,
Cleankeys keyboards have three special keys for
completing special functions.
Keylock
You use this key to deactivate key and touch-pad
functions so that you prevent any unintentional
triggering (e.g. during a cleaning operation).
In order to lock the keyboard, place your finger on the
"Keylock" key for about 2 seconds. The LED status
bar will flash and then remain on permanently. The
key and touch-pad function is then locked. To unlock
it, place your finger on the key again. When the LED
status bar is no longer illuminated, the keys have
been activated again.
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