PLANTRONICS 85618-05 BLACKWIRE C310 M Plantronics BLACKWIRE C310 M 85618-05 Please ensure that your original part number matches this exactly, or check with the manufactuer for compatiblity. Customers are responsible for compatiblity. This part is guaranteed to be fully functional, original and authentic. Plantronics BLACKWIRE C310 M 85618-05