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In car harness. This is the main interface from radio to helmet to push to talk. Required for most all 2 way systems. There are 2 types: 3 and 4 Conductor. You can determine the correct unit buy the number of black rings on your helment mic kit. 3 rings is 4c and 2 rings is 3. If you are purchasing a new kit, the default is 3 conductor.