This product is either discontinued or we cannot get that from suppliers.
Poly Plantronics Encorepro 203446-01, On-ear - over-the-ear mount, Wired, Sound Mono, Microphone Boom, Controls Mute, volume, answer/end.
Plantronics EncorePro HW535 USB computer over-the-ear Headset. Plantronics HW535 USB is designed for heavy call centers that require a VoIP USB headset solution. It offers all-day comfortable use and excellent audio.