10UNIDEN UH5000 UHF CB TransceiverTurning on the PowerPress and hold the Power/Channel Selector.OperationNOTELow-Voltage/High-Voltage AlertIf the power supply voltage exceeds 18VDC, an alert tonesounds and dc HI flashes for 5 seconds. The power sourcemust not exceed 25VDC otherwise permanent damagemay occur to your radio, which may not be covered by themanufacturer’s warranty.If the input voltage falls below 10VDC, dc Lo flashes for 5seconds. The power turns off automatically if voltage fallsbelow 8.5VDC.Switch your UH5000 OFF and disconnect it from the powersource, before locating the cause of the power supply problem.Setting the Squelch LevelPress the Power/Channel Selector momentarily. SqL shows and thecurrent squelch level will flash.Turn the Channel Selector to select the desired squelch level.