This product is either discontinued or we cannot get that from suppliers.
Manufacturer: Poly, Manufacturer Part Number: 211076-01, Brand Name: Plantronics, Product Name: APU-76 (UC Adapter) Electronic Hook Switch Cable, Product Type: Electronic Hook Switch, Weight (Approximate): 1.41 oz, Application/Usage: Headset, Telephone
Extend the wireless freedom of DECT and 900 MHz headsets to your UC system and manage softphone calls with any CS500 Series, CS500 XD Series, or Voyager Legend CS headset.