Plantronics MDA220 Multi Device USB Adapter (for PC and Telephone)
Poly BT300-M Bluetooth USB Adapter 85117-01 B&H Photo Video
Amazon.com: daily headset USB Adapter Cable Compatible Plantronics QD (Quick Disconnect) to USB Plug, Speaker Volume & Mic Mute Control Connects Headset to PC, Laptop, Soft Phone and More : Electronics
Plantronics Audio DSP Adapter
DA40 USB Headset Adapter
Poly BT700 Bluetooth USB-A Adapter (217877-01) - IP Phone Warehouse
Amazon.com: Poly - DA85 USB-A/USB-C digital adapter (Plantronics) - Works with Poly Call Center Quick Disconnect (QD) Headsets - Acoustic Hearing Protection -Works with Avaya, Genesys,&Cisco call center platforms : Cell Phones