Roberts Radio R972 - Manual (Page 6)

Lock Switch
The Lock switch (14) is used to prevent unintentional operation of the
radio.
Set the Lock switch located on the right side of the radio to the up
(locked) position. The Power and all other buttons will be disabled, this
will prevent accidental operation when the radio is packed in a suitcase
or travel bag.
To prevent accidental operation of the controls when the radio is
switched on set the Lock switch to the up (lock) position
the
symbol will appear in the display. To release the Lock
switch move the Lock switch to the down (unlock) position, the
symbol will be removed from the display.