255MENU MODE■ MENU mode items (Continued)D Microphone2 Gain “MIC2 GAIN”Set the microphone2’s gain.• –010–010 : Setting the microphone2’s gain from –10 to +10.D Sidetone Level “SIDETONE LV”When using an optional headset (supplied from 3rd party*)via the adapter, the transceiver outputs your transmittedvoice to the headset for monitoring.*Ask your dealer in details.• OFF (0) : The sidetone function is OFF.• 001–080 : Sets sidetone level from 1 to 80.D Transmitting Microphone Selection“TX MIC SEL”Set the active microphone when pushing microphone’s PTTswitch.The item allows you to control which connected microphoneis permitted to transmit.• MIC1 : Selects microphone1.• MIC2 : Selects microphone2.• MIC1+2 : Selects both microphone1 and microphone2.D Dimmer Mode “DISP MODE”The light sensor which is built into the display is used for thisfunction.Set the OLED dimmer mode.• OFF : The dimmer function is OFF.• AUTO : Sets the dimmer automatically depending on localbrightness.• MANUAL : Sets the dimmer depending on Dimmer Brightness(Low) “DISP LOW”.D Dimmer Brightness (Low) “DISP LOW”Set the lower brightness level in the automatic adjustmentrange when “AUTO” is selected at the “Dimmer Mode.”The transceiver automatically adjusts its display brightnessby the current lighting conditions.• OFF : The key backlight sets OFF.• 001–049 : Sets low dimmer brightness level from 1 to 49.D Dimmer Brightness (High) “DISP HIGH”Set the upper brightness level in the automatic adjustmentrange when “AUTO” is selected in the Dimmer Mode.• 050–100 : Sets dimmer brightness level from 50 to 100.05