JTS CS-120 Series Manual page 29

And the settings of alert time before the speaking ends. Press "Next" to enter
the settings of speaking time; press Up/Down to adjust the time value, and
the range is 1-255 minutes. Press "Next", and the cursor will move to the
settings of alert time before the speaking ends; Press Up/Down to adjust the
time value, and the range is 2-255 seconds.
Confirm the value, press "Enter", and save the settings.
4-3-3-6 " Panel Lock "
Set CU Panel knobs as "Lock" or "Unlock".
This function to prevent inadvertently change the operating mode of the CU.
Press Up/Down to select Lock / Unlock knobs of CU.
Press "Enter" to confirm and return to the main directory.
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CS-120 Conference System Product Manual