The Poly DA85 (also listed as Plantronics DA85 or HP Poly DA85) is a smart digital USB headset adapter. It connects legacy quick-disconnect (QD) office headsets (such as the Poly/Plantronics EncorePro / HW-series) to a computer via interchangeable USB-A and USB-C connections.Connectivity: Quick Disconnect (QD) to USB-A and USB-C• Compatibility: Works with Poly (Plantronics) HW-series and EncorePro quick-disconnect headsets.• Audio Quality: Advanced digital signal processing (DSP) and noise reduction for clear calls.• Inline Controls: Call answer/end, mute, and volume adjustments.