If you have a Northern Telecom Meridian (“Nortel”) or Norstar phone, you will need to purchase this kit in order to use the HL10 Lifter. This kit has a extension microphones that is placed on top of your telephones speaker. It also comes with an extender arm for Nortel phones that have a curved design (such as the Nortel M3900 series).
**This kit comes standard with the Plantronics CS50 Wireless System. Only purchase this item if you have misplaced your original ring sensor kit or you are using a different wireless system and have installed the HL10 Lifter.