PLEASE READ ENTIRE DESCRIPTION PRIOR TO ORDERING. USE CAUTION WHEN CHOOSING CORDS, THEY ARE DIFFERENT CORDS FOR DIFFERENT APPLICATIONS.Brand NEW cords, instock, fast shipping, ordering more than one save $$$ on shipping! These are DASAN manufactured for the plantronics amplifiers and headsets. Can use with any headset that has a PLT compatible quick disconnect on it.  For use with M10 or M12, M22,  AP15 amps and their headsets.  Cord goes from amplifier to H/HW series Plantronics headset.  It has a PLT QD on one end and a modular RJ11 clip on the other.  This cord works Great with a PLT QD headset for direct connection on Cisco 7940, 7960 series phones that have designated headset ports. We only sell NEW cords, it is not recommended to buy a used cord.  Will NOT work on S12's, T10's or T20's need different cord for those. This cord is NOT a polaris cord.  This is NOT the cord for direct in on polycom phones.  ANY QUESTIONS ON THIS CORD WITH A PARTICULAR PHONE OR SYSTEM EMAIL OR CALL US PRIOR TO ORDERING IT, we will be happy to check the compatibility for you. Dasan manufactured product. Generic version of plantronics amplifier replacement cords 26716-01