Replacement cord for PLT QD Headsets to Plantronics Amplifiers-M12,M22,AP15 Dasan manufactured for PLT QD compatible headsets, Smith Corona P Series, VXI P series, Starkey P Series Connect the PLT QD headset to their amplifiers, M10,M12,M22's, AP15 Contact HEADSET WORLD USA PRIOR to ordering with any questions regarding compatibility. Will also work with PLT QD headset to plug direct in to a Cisco 7900 series phone PLT compatible QD on one end, RJ9/11 clip on the other end which goes into amp Can use on any headset that has a plantronics compatible quick disconnect on it, VXI P series, Smith Corona P series, Starkey PL Series