FARO Low to High Impedance Adapter (Aviation Headset Converter) General Aviation (GA) and Military Headset Adapter Low impedance mic and phone military headset converts the military headset U-174/U plug into .206 and .25 inch plugs that are utilized in General Aviation airplanes. High quality connectors are 25 inches long, providing additional headset extension and ensures a secure fit. Used to convert military helicopter helmets to civilian use. Durable Product with US Engineered Quality