Check the listing for details. Replacement Dynamic Noise Cancelling Aviation Microphone David Clark 5 Ohm M-2H. Condition: Used. Listed at 20.00 USD. This Replacement Dynamic microphone has been tested and meets David Clarks specs. This High Output M-2H 5 Ohm Dynamic Microphone is a noise canceling type designed to operate in High Noise environments.P/N 09468P-75 If unsure about compatablity with your headset, consult with your radio technical manual or with your local avionics shop. See my Headsets and parts that I have for sale at my eBay Store http://stores.ebay.com/KC-Headsets About KC HeadsetsKC Headsets is a pilot-owned and family operated aviation Headset Repair station and retailer based in the Kansas City Missouri area. We focus on bringing affordable repair services, aviation headsets and accessories to the aviation community. Visit our website to learn more.