Plantronics HL10 Ring Sensor extender arm kit for Meridian and Nortel Phones (Part #63014-01)
If you have a Northern Telecom ("Nortel") Meridian or Norstar telephone, you will need this external ring sensor kit in order to utilize the Plantronics HL10 handset lifter properly. It plugs easily into the accessory port on the HL10 lifter and the ring sensor sits atop and adheres to the speaker of your telephone. (Note: This kit also comes with extender arm for Nortel M3900-series phone models which have a curved side design.)
Note: Nortel phone models M7100-M7900, M3901-M3905 and others require this optional for proper Lifter operation. Phone models T7208 and T7316 do not require this part.