Plantronics Noise-canceling microphone, digital sound processing, and wideband PC audio support for business-class clarityOffered in three state-of-the-art wearing stylesDECT 6.0 for an interference-free wireless range of up to 350 feetBase unit accepts up to 4 headsets for on-the-fly conferencingIntegrated PerSono Suite software for one-touch call answer/end with supported softphones and wide range of customization featuresOptimized for Microsoft Office Communicator 2007 supporting one-touch call control with Office CommunicatorOne-year limited manufacturer's warrantyPL8179401