Polycom Compatible Plantronics Noise Canceling HW510 EncorePro 510 Headset Bundle for SoundPoint: IP 300 335 450 501 550 560 600 650 670 | VVX 300 310 400 410 500 600 1500 | CX 300 600 700 Bundle of 2 items - Plantronics HW510 EncorePro 510 Headset and Polycom compatible telephone interface cable Compatible Polycom Phones: IP 300, 301, 335, 430, 450, 500, 501, 550, 560, 600, 601, 650, 670, CX 300, CX 600 CX 700, VVX 300, VVX 310, VVX 400, VVX 410, VVX 500, VVX 600, VVX 1500 Quick Disconnect - Allows for easy disconnect from phone without removing headset Ultra Noise-Canceling microphone filters out background sound Plug-n-Play easy of use, Premium Plantronics Wideband Audio