Polycom Compatible Plantronics VoIP Headset Bundle | SoundPoint: ip430, ip450, ip501, ip550, ip560, ip 601, ip650, ip670, CX300, CX500, CX600, VVX101, VVX201, VVX300, VVX310, VVX400, VVX410, VVX1500 BUNDLE OF 2 ITEMS:  Plantronics EncorePRO HW520 Headset & Polycom Telephone Interface Cable QUICK DISCONNECTIVITY:  Allows for easy disconnect from phone without removing headset COMPATIBILITY:  Compatible Polycom IP Phones: IP 450, IP 501, IP 550, IP 560, IP 601, IP 650, IP 670, VVX300, VVX310, VVX400, VVX410, VVX500, VVX600, VVX1500, CX300, CX600 NOISE CANCELLING:  Ultra Noise-canceling microphone filters out background noise GLOBAL TECK SERVICE: Low-cost, affordable, commercial-grade headset.