Audiovox FR-314 - Manual (Page 26)

Keypad Lock
To prevent the transceiver’s settings from being inadvertently
changed, the keypad can be locked. When the keypad is locked,
only the volume is adjustable, the other functions can be viewed,
but not changed. This is useful when the FR-314 is being used
by small children, or when the unit is kept in a pocket. A key
icon will be shown on the display whenever the keypad is
locked. To lock or unlock the keypad, press and hold the func-
tion button for 2 seconds.
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Keypad Lock Icon