235MENU MODE MENU mode items (Continued)D Sidetone Level “SIDETONE LV”When using an optional headset (supplied from 3rd party*)via the adapter, the transceiver outputs your transmitted voiceto the headset for monitoring.*Ask your dealer in details.• OFF (0) : The sidetone function is OFF.• 001–080 : Setting sidetone level from 1 to 80.D Transmitting Microphone Selection“TX MIC SEL”Set the usable microphone when pushing microphone’s PTTswitch.The item allows you to control which connected microphoneis permitted to transmit.• MIC1 : Selecting the microphone1.• MIC2 : Selecting the microphone2.• MIC1+2 : Selecting both the microphone1 and microphone2.D Dimmer Mode “DISP MODE”Set the OLED dimmer mode.• OFF : The dimmer function is OFF.• AUTO : Set the dimmer automatically depending on local bright-ness.The light sensor which built-in the display is used forthis function.• MANUAL : Set 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 : Setting 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 at the Dimmer Mode.• 050–100 : Setting dimmer brightness level from 50 to 100.05