Is there a calibration curve available somewhere for the Audiomoth with the MEMS microphone ?
This calibration curve should give the sensitivity versus frequency for at least one direction. Is this sensitivity flat versus frequency up to 100 kHz ? Without an answer to this question, it is very difficult to evaluate the potential usefulness of this product to records bats for example.
Yep @Edwin Houwertjes is correct. AudioMoth 1.0.0 and 1.1.0 use the SPM0408LE5H - datasheet here. AudioMoth 1.2.0 uses the SPU0410LR5H - datasheet here.