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Transmission Indicator
Call Button Indicator
Low Battery Alert Indicator
Battery Saver Mode Indicator
Beep tone Indicator
FRS Channel Indicator (1–14).
Continous Tone Coded Squelch System (CTCSS)
codes 1-38.
Busy Channel Indicator. Appears on display when
unit is receiving a signal.
SCAN Indicator. Appears on display during channel
scanning.
Key Lock Indicator
VOX Function Indicator
Volume Level Indicator
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LCD DISPLAY AND OPERATION
The FR-540 is equipped with an LCD display
to indicate its settings and functions.
When the radio is on, pressing any button
will illuminate the display for 5 seconds.
BUSY
SCAN