This product is either discontinued or we cannot get that from suppliers.
Poly Plantronics 209506-01 Usb-c To Usb-a Adapter, Black, Compatible with Plantronics Blackwire 3200 and 5200 Series headsets.
Ideal for converting Plantronics headsets from USB-Type C to USB-Type A. PC and Mac compatible with Plantronics Blackwire 3200 Series and Blackwire 5200 Series headsets.