Panasonic KX-TGM420 Operating Instructions Manual page 76

Handset sound enhancer
This feature can improve sound clarity when the
handset is used in an area where there may be
interference. During an outside call, this feature is
turned on automatically when necessary.
• When this feature is turned on,
Handset noise reduction
This feature allows you to hear the voice of the person
you are talking to more clearly, by reducing the
surrounding noise coming from the other party's
telephone.
1 Press [MENU] while talking.
2 [ ]: "Noise reduction on" or "Noise reduction
off"  [SELECT]
Note:
• Depending on the environment where this handset is
being used, this feature may not be effective.
• This feature is not available while using the
speakerphone.
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