Poly-Plantronics
Plantronics HW710 Encore Pro Monaural Wideband Headset 78712-101
Plantronics HW720 Encore Pro Binaural Wideband Headset 78714-101
Plantronics EncorePro HW510V Voice Tube Headset 89435-01
Plantronics EncorePro HW510 Monaural Headset
HP Poly EncorePro HW520 Binaural Headset is now HP 520 783P6AA#ABA