The adapter cord, converts the H series headsets to Polaris A10

This is the Plantronics A10 Cable is a special cord (QuickDisconnect) that allows for Plantronics headsets (H-series) to be connected to headset-ready phones (ie. Nortel) which would normally take a Plantronics P-series Polaris headset. If you have Plantronics H-series headsets and a new Polaris-compatible telephone (with a built-in headset port) is purchased. By using this cable, you can keep your existing headsets rather than having to buy new Polaris-versions.