I have just gone back to using an Audiomoth USB microphone with the Audiomoth Live App for bat activity monitoring but found that the display appears to only show frequencies up to about 20kHz ? (see attached screen shots for setting details etc.)

I seem to remember from the dim and distant past that I "had to remember to click on ..............." on the Audiomoth USB App settings to get the full spectrum displayed but can't find anything now that changes the displayed spectrum !

Must be senile dementia !!!!!!!!!!!!!