Amazon.com: Plantronics Headset to USB Adapter (DA40) : Electronics
Poly Plantronics APU-76 USB Electronic Hook Switch Cable 211076-01
For Plantronics Usb Adapter 01 (dsp Headsets) 76962-01 - Used - Chargers - AliExpress
Plantronics Voyager 5200-UC Bluetooth Headset | USB Dongle and Charging Case 206110-101 | For Smartphones, PC, MAC, Tablet, Softphones, VoIP, Unified Communications
Plantronics EncorePro HW515 USB Headset (203442-01)