Icom IC-M501 Operational Manual page 11

7 Internal Speaker off
It shows that internal speaker is off
The radio was turned on ATT, the readout shows LOCAL instead
8 receive attenuator (Harbor mode) indicator
To eliminate interference at harbor, you may turns on the attenuator on the
receiver
9 low battery indicator
LOW BATTERY indicator shows up if supplied DC voltage is less than 10.8V.
This will warn the operator to let him or her know the low DC supplied voltage
to the radio
IC-M501
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