Thank you very much for this information, I will change the batteries before using them again this month. Is there anything I can do to avoid the noise due to the temperature?

Sampling rate 384kHz, and the card is SanDisk Extreme 32GB (not extreme pro) the audio moth devices are in a forest (inside a ziplock), an yes, it ocurres in some recordings. Also, sometimes this noise appears too at 86kHz:

Hi, I am having the same problem with the "clicking" noise at 18-20kHz. If I slow down the rate to 0.2 it sounds like a clock. I have 4 AudioMoth devices, all with Energizer AA batteries and sand disk extreme of 32gb. The noise appears in a few recordings regardless the device (it appears in all of them but we don't know what's activating it). However, when analyzing the spectrogram it becomes an issue because it overlaps with the sounds we are interested in.

Hi Alex, thank you for your prompt response. No, I can not find the status of the order, is it different for each order? , Sofía