NEC DT300 Series - Page 22

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To Adjust Transmission/Receiving Volume
Handset volume can be changed.
 Press Feature and 4. The LCD displays the current
volume.
4:26 PM TUE 13 APR 2008
 Press Feature and 4 again to alternate between
Small and Large volume.
4:26 PM TUE 13 APR 2008