![Amazon.com : Polycom Compatible Plantronics VoIP Noise Canceling EncorePRO 540 HW540 Headset Bundle for IP320, IP321, IP330, IP331 : Office Products Amazon.com : Polycom Compatible Plantronics VoIP Noise Canceling EncorePRO 540 HW540 Headset Bundle for IP320, IP321, IP330, IP331 : Office Products](https://m.media-amazon.com/images/I/61BvcbbrbJL._AC_SL1000_.jpg)
Amazon.com : Polycom Compatible Plantronics VoIP Noise Canceling EncorePRO 540 HW540 Headset Bundle for IP320, IP321, IP330, IP331 : Office Products
![Plantronics ENCOREPRO 540 (HW540) Wired Headset | For Nortel, Polycom, Cisco, Mitel, Avaya, ShoreTel and other business phones | Requires Adapter Plantronics ENCOREPRO 540 (HW540) Wired Headset | For Nortel, Polycom, Cisco, Mitel, Avaya, ShoreTel and other business phones | Requires Adapter](https://cdn11.bigcommerce.com/s-dc251/images/stencil/1280x1280/products/907/3909/hw540_3__70131.1457055790.png?c=2)
Plantronics ENCOREPRO 540 (HW540) Wired Headset | For Nortel, Polycom, Cisco, Mitel, Avaya, ShoreTel and other business phones | Requires Adapter
![Amazon.com: Plantronics - EncorePro HW540 Convertible Headet - Wired Convertible (3 wearing styles) Headset with Boom Mic - Connect to your PC and/or Deskphone : Electronics Amazon.com: Plantronics - EncorePro HW540 Convertible Headet - Wired Convertible (3 wearing styles) Headset with Boom Mic - Connect to your PC and/or Deskphone : Electronics](https://m.media-amazon.com/images/I/71uY9FLcF6S._AC_SL1500_.jpg)
Amazon.com: Plantronics - EncorePro HW540 Convertible Headet - Wired Convertible (3 wearing styles) Headset with Boom Mic - Connect to your PC and/or Deskphone : Electronics
![Plantronics ENCOREPRO 540 (HW540) Wired Headset | For Nortel, Polycom, Cisco, Mitel, Avaya, ShoreTel and other business phones | Requires Adapter Plantronics ENCOREPRO 540 (HW540) Wired Headset | For Nortel, Polycom, Cisco, Mitel, Avaya, ShoreTel and other business phones | Requires Adapter](https://cdn11.bigcommerce.com/s-dc251/images/stencil/1280x1280/products/907/3903/plantronics_m22_vista_headset_adapter_43596_40_04025.1405374363.1280.1280__28008.1457051659.jpg?c=2)