USB ADAPTER für Plantronics CS50 CS55 CS60 CS70N CS351N CS510 CS520 CS530 CS540 | eBay
How To Set Up Plantronics CS540 With D315 USB Adapter For Computer Connectivity - YouTube
Amazon.com: RJ9 Plug to USB Headset Adapter Compatible with Plantronics Jabra Sennheiser Wireless DECT Headsets for Use with Computers PC Laptop Mac Tablet Window Softphones Devices : Electronics
RJ9 Female to USB Plug Cable for Plantronics CS540 & Jabra PRO 920 to Computers | eBay