Herelink Blue frequency units?

I am new to this forum so please bear with me…
I have a model HLBC-1001 radio controller. The things pairs ok with the air unit.
Can anyone explain to me what frequency of 47835 means in the NWBlue settings page? Is it 47.835 MHz? If so how can this be if the unit operates in the 2.4 GHz ISM band?
I can’t make any sense of it.
Thanks in advance for any help.