Plantronics DA40 USB Headset Adapter (71800-41) - Newegg.com
PLANTRONICS DA40 USB SPECIFICATIONS Pdf Download | ManualsLib
Plantronics DA45 USB Adapter Cord for H & HW series headset to Computer NEW Box 17229126961 | eBay
Application Notes for Configuring Plantronics DA40 USB Adapter, Plantronics SupraPlus Wideband and EncorePro Headsets with Avaya
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