System FunctionsThe SL40 includes a number of System Functions thatgive you more information about your communicationequipment. Press and hold the MON button for aboutthree seconds to reach the System Function. Turn theLarge, outer knob to display the available functions.Adjustments are made with the Small, inner knob.SoftwareVersionThe Software version is available for reference whenyou contact Technical Support.10System FunctionsSW VER x.xxSoftwareVersionRFLevelNoiseLevelTurn LARGE KnobMONPress for about two sec.HeadphoneLevel000255LowDisplayLevel0050Mic1Squelch000127 IntercomLevel000255SidetoneLevel000255HighDisplayLevel0050Mic2Squelch000127TransmitMic1+2Mic1 OnlyMic2 Only