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The microphone used is a 3 terminal electret condenser microphone insert.
It has an integral high sensitivity electret microphone which can be mounted on the board or extended up to 50 feet using suitable cable.
It is fully tuneable from 100-120MHz and has high sensitivity on-board electret microphone able to clearly monitor sounds up to 25 feet away.
An additional circular plate included an opening for the holding electret microphone, flush mounted with the baffle plane.