Here’s a nifty test video by forum user Potatotron
This module is designed for Teensy boards and has the proper signal voltages for use with the audio library. It uses the MAX9814 – a high quality, now noise, pre-amp chip. This module is designed to work directly with the Teensy analog inputs – you don’t need the audio shield to use this module.
If you are doing any project that requires a microphone and a Teensy, go buy this now.