The new AudioMoth 1.2.0 with firmware version 1.5.0 on-wards can be adapted to be compatible with external electret condenser mono microphones, commonly known as plug-in powered (PIP) microphones.
To adapt the hardware, you'll need the 3.5 mm jack socket (SJ2-35464A-SMT-TR), which can be soldered to the exposed pads on the front AudioMoth surface.
The 3.5 mm jack socket can be sourced from a number of suppliers here.
PIP microphone assemblies are available, such as the Primo EM258 or they can be built from components. AudioMoth 1.2.0 can be used with a wide variety of differently wired 3.5 mm jack plugs. To find out more, read our full application note on using AudioMoth with external microphones here.
I've found a waterproof electret omnidirectional microphone I would like to try with the AudioMoth 1.2.0 - https://www.digikey.com/en/products/detail/cui-devices/CME-1538-100LB/2364631. It comes with leads (ground & signal), but in the application note it says, "The jack detect must be pulled low to enable the external microphone." Am I correct to solder a jumper to ground from the jack detect to permanently activate the external microphone? I'd also appreciate any thoughts on this microphone if anyone has any. Thanks.