2.5mm Headset Cord for ALL Plantronics QD Compatible Headsets Connects directly to a 2.5mm headset jack on most basic and business phones Works with Plantronics H/HW series. VXI P series, Smith Corona P Series, Starkey PL Series, The One Headsets Quick Disconnect allows you to disconnect from your headset without losing your call Plantronics QD compatible quick disconnect on one side, 2.5mm prong on the other Contact HEADSET WORLD USA PRIOR TO ORDERING WITH ANY QUESTIONS