Plantronics blackwire c320 uc bin moc headset black the comfortable and user friendly plantronics blackwire c320 is a binaural headset featuring simple inline controls to allow you to answer and end calls at the click of a button the adjustable lightweight metal headband makes this a durable and comfortable headset and the exclusive dynamic eq automatically adjusts settings to provide an exceptional sound quality a noise cancelling microphone filters out background noise for increased intellig