Amazon.com: Plantronics BT600 - Network adapter - USB - Bluetooth : Cell Phones & Accessories
Plantronics BT600 USB-A Bluetooth Adapter | Compatible with PC/Mac | 205250-01
Plantronics BT300 Bluetooth USB Adapter 85117-02 B&H Photo Video
Plantronics BT600 Bluetooth USB Adapter for Voyager 5200 and Focus UC 205250-01 17229150393 | eBay
DA40 USB Headset Adapter
Amazon.com: USB Adapter Compatible with Any Plantronics or TruVoice Wired Headset with a QD and Includes Volume Control and Mute Functionality (Connects Headset to PC, Laptop and Softphones) : Electronics