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                       Q6. What's the mean by "38 Fixed-channels and 32 User-channels"? | 
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                       38 fixed channels, means the frequencies of those 38 channels is unchangeable. | 
                     
                     
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                       Just like frequency version F858-24, its frequency range is 846-870MHz, frequency of the first channels CH1 is  | 
                     
                     
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                       846.375MHZ, frequency of the second channel CH2 is 847MHz…. and frequency of the 38th channel is 869.5MHz, | 
                     
                     
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                       channel tunable step is 625KHz. | 
                     
                     
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                       32 user channels, means there are 32 channels’ frequencies can be set by user own. | 
                     
                     
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                       If frequency version is F858-24, frequency range is 846-870MHz. There are totally 32 user channels U1-U32, frequency | 
                     
                     
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                       of each channel can be set by user own in the frequency range 846.000-870.000MHz, channel tunable step is 25KHz. | 
                     
                     
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