Amazon.com: 504P USB Adapter for Plantronics and Addasound Headsets - by Global Teck Worldwide - Connects to Headset to PC, MAC, Lync, Skype & USB VoiP Phones - Mute, Volume and Quick
DA300-QD USB Adapter Cable for Plantronics H & HW-series Headsets to Computers | eBay
Amazon.com: Plantronics DA40 USB Digital Adapter (Discontinued by Manufacturer) : Electronics
BT600 USB-A / USB-C Adapter - High-fidelity Bluetooth USB Adapter | Poly, formerly Plantronics & Polycom
Plantronics TR-11 Adapter | 88608-11 - Headsets Direct
Plantronics AC Power Adapter for Plantronics Wireless 80090-05
Plantronics UK & EU Adapter w/ Straight DC Plug for WO300 CS510 CS540 W720 W740 | eBay