Icom IC-440N Instruction Manual page 17

!6 INTERNAL SPEAKER MUTE INDICATOR (p. 14)
Appears* when the volume level is set to 0 (the audio is
muted).
*Depending on pre-setting.
!7 QUIET INDICATOR (p. 39)
  Appears when the Quiet function is ON. (SelCall mute is
activated)
Information:
"N/A" appears if the pushed key is not usable.
UNIT DESCRIPTION
2
2
11