Plantronics Headset Replacement Cable - 10 ft Phone Cable for Phone - First End: 1 x 4-pin RJ-11 - Second End: 1 x Proprietary - Black - 1 Each Coiled cord connects any H-Series headset with a quick-disconnect plug to compatible Plantronics amplifiers or phones with compatible headset ports. Quick-disconnect feature lets you easily detach the cable when needed. Cord is designed for use with the Plantronics EncorePro, DuoPro and TriStar headsets.