This is the Poly (Plantronics) USB-C to USB-A Adapter.  Converts the smaller Poly USB-C headset to a USB-A headset. This adapter is both PC and Mac compatible for all Plantronics Blackwire, Savi, Calisto or Voyager UC Headsets.

Key Features:

* Compatible with All Plantronics USB headsets (wired) or wireless USB Headsets