Plantronics EncorePro HW510V Mono Headset with DA80 Audio Processor for Computer

Plantronics Encorepro 510 - HW510 - Quick Disconnect - QD Headset with Mic

Plantronics DA80 USB Audio Processor Telephone Headset

Plantronics DA80 USB Audio Processor + HW 510 Noise-Cancelling Headset

Plantronics HW510 Encorepro Noise Cancelling over Head Monaural Headset, Black

LOT OF 3 Plantronics EncorePro HW510 Mono Headsets + 1 DA80 USB Audio Adapter

Plantronics Encore Pro HW720 Binaural Headset & Poly DA80 USB Audio Processor

Plantronics Encorepro 510-HW510-Quick Disconnect-QD Headset with Mic (untested)