Plantronics black c310 uc blackwire headset product overview plantronics black c310 uc blackwire headset 85618 02 the comfortable and user friendly plantronics blackwire c310 is a monaural 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