David Clark M-101/A1C Dynamic Microphone| 09168P-20
The M101/A1C is a noise-canceling, dynamic microphone. It is very robust and can be used in many communication systems.
Note: This microphone requires DC bias voltage, which is supplied by most modern, aviation communication equipment. If you are unsure whether or not your aircraft uses this type of voltage, please consult your radio technical manual and/or avionics shop for more info.