Audiovox FR-140 Owner's Manual page 16

Button Conformation Tones
The transceiver can be set to confirm each button press with a
beep tone or, if the user prefers, these confirmation tones can
be turned off. Whenever the tones are on, the icon will be
shown on the display. To turn the beep tones on or off, press
the menu button three times or until "BP" shows on the display.
The current setting will be indicated by the two smaller characters
to the right ("on" or "of" (off)). Press the UP or DOWN button to
change the setting. After 5 seconds, the unit will return to the
standby mode.
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