Genuine A10 Cord (part number 66268-02, formerly 66268-01, 66268-03 or 33669-01 also called A10-16) is a special cord (QD - Modular) which makes an H-series headset act like a P-series Polaris headset. Beginning August 15, 2008, Plantronics discontinued its line of Polaris (P-series) headsets. All telephones that formerly were compatible with Plantronics Polaris headsets will now be directed to purchase the Plantronics H-series headsets (exact same styles but models start with H instead of P) and this A10 bottom coiled cord. Together the H-series headset and the A10 cord are equivalent to the former Polaris models. No amplifier is needed. This generic Plantronics A10 Direct-Connect headset cable is for call centers that use both Plantronics Polaris brand headsets and amplified headset sol.