ANR Kits - Active Headsets Inc - Active Noise Reduction
Avionics from Bose - Since Bose introduced active noise reducing headsets to the aviation industry, pilots have made them their #1 preference year after year.
Headsetinc ANR Retrofit – myclimbrate
M-7 / DC Microphone Retrofit Kit
ANR RETROFIT HEADSET KIT from Aircraft Spruce Europe