NEC NEAX 2400 IPX Reference Manual page 17

LCD (Liquid Crystal Display)
The LCD provides visual Dterm activity plus the date,
time and Softkey detail.
LED (Light Emitting Diode)
Some function keys have a built-in LED that lights or
flashes according to the activity of that function key.
MIC (Microphone)
Lamp displays the status of the built-in microphone
used for hands free operation to the activity of that
function key.
Display
To adjust the Display:
Press the
idle.
Speaker/Receiver Volume
Adjust Speaker/Receiver Volume:
Press the
Ringer Volume
Adjust Ringer Volume:
Press or
Feature Key Activities
Feature + 0 Side Tone ON/OFF.
Feature + 1 Turns MIC ON/OFF.
Feature + 2 Adjusts handset receiver volume.
or key up or down while the phone is
or key up or down during conversation.
key up or down during ringing.
17