What is the USB device you are trying to record to and I guess I am wondering: Why? Is it perhaps a means to transmit your data?

Thanks Alex, I guess it will have to be custom firmware for my project then. In any case the 1.3.1/1.4 combo is a great help for my other uses of AudioMoth.

Thanks Peter, Alex and co for the wonderful update to the firmware and configuration software. I have a request for consideration in future versions of the configuration App. I hope this may not require variation to the firmware. The delayed scheduled start and stop (First/Last recording date) function is already useful in giving us three levels of scheduling. I would find it even more useful if I could apply more start and stop dates. I am working with the µMoth for a long term on-animal deployment where ideally the µMoth will not be in contact with a user until final retrieval. A limit on battery size means I cannot record continuously and I'll have to have extended off periods if it is to make it through more than one season of sampling. The interface for this could be done by changing the first/last portion of the schedule tab to become a scrolling list where the user could add as many first and last lines as required. Alternatively this could be combined with the "Add recording period" section so that the list of recording periods is a combined Active days (dd/mm/yyyy to dd/mm/yyyy for hh:mm to hh:mm) and repeated for each successive date period. That way it would also be useful for those trying to track sunset or sunrise times through autumn or spring as they could just make a continuous stream of one week periods where the start and stop times are progressively incremented appropriate for the location. (I'm assuming there is no plan to incorporate an almanac into the firmware). Any ideas on how hard that would be?

I think Sandor is referring to the amplitude threshold recording in the Advanced settings. But you probably already worked this out.

Can you give some more details of what has happened? You say the batteries are fine: What voltage are they registering? Is the switch set to USB/Off? Was the AudioMoth housed in something while outside?

Any update on a release date or specifications for the μMoth. We are keen to strap audio devices onto Koalas but we will need to know the power draw of the μMoth to determine if this is our best option. The regular audiomoth has great sensitivity for recording low (even subsonic) frequencies so we are hoping that this version will also and that it is released sooner rather than later.