Plantronics EncorePro HW510V Mono Headset with DA80 Audio Processor for Computer | eBay
Plantronics HW520-A10 EncorePro Binaural Over the Head Noise Cancelling Headset with Mic and Plantronics Direct Connect Cable / Office / Headsets - YBSales.com
404008024-03 Plantronics EncorePro HW530 Over the Ear Monaural Headset 201500-01 20150001
EncorePro 300 Series - Customer Service Headsets | Poly, formerly Plantronics & Polycom