The without a microphone does not have the function of answering calls, while the with a microphone has the function of answering calls. For for BMW (E46): 320i, 320ci, 320cic, 323i, 323ci, 323cic, 325i, 325ci, 325cic, 328i, 328ci, 328cic, 330i, 330ci, 330ci & for M3 (For coupe, sedan and convertible) 09 / 2002-2006.
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