408 SET MODEDD DSC watchDSC watch monitors Channel 70 while you are receiving an-other channel.If a distress signal is received on Channel 70, the transceivermonitors Channel 16 and 70 alternately until the distress sig-nal disappears. If a signal is received on another channel,DSC watch pauses until the signal disappears.This function may not be available for some channelgroups depending on dealer setting.DD Beep toneYou can select silent operation by turning beep tones OFF, oryou can have confirmation beeps sound at the push of a keyby turning beep tones ON.The optional HM-127 has its own setting for the beep tone.DD Internal speakerWhen an external speaker is connected and the transceiver’sinternal speaker is not required, the speaker on the trans-ceiver and microphone can be deactivated.“SP OFF” appears on the function display when the internalspeaker is turned OFF.• The order of indication precedence is “SP OFF,” “LOCAL” and“CALL.”DD LCD contrastThis item adjusts the contrast of the LCD in 8 steps.The optional HM-127 has its own setting for the LCD con-trast.Set ModeLCDContrastLCD contrast 4 (default)Set ModeInternalSpeakerInternal speaker ON (default) Internal speaker OFFSet ModeBeepBeep tone ON (default) Beep tone OFFSet ModeDSC watchDSC watch OFF (default) DSC watch ON