Plantronics P420 Calisto USB Speaker Phone UC Standard. Wherever the need arises to conduct hands-free, PC-based calls and web conferencing, the compact and portable Calisto 420 USB speakerphone caters to spontaneous collaboration. Advanced wideband audio, and a powerful 360-degree omni-directional microphone, transforms any workspace into a conference room, increasing productivity for everyone on the call. A convenient headphone jack accommodates private calls. Work quickly and easily. The Calisto 420 USB speakerphone simplifies PC calls and web conferencing collaborationUC Standard version built for UC applications and softphones from Avaya, Cisco, IBM and morePortable conferencing and collaboration, perfected.Work Together, No Matter Where You Are360-degree microphone and speaker coverage for small to medium-sized roomsDigital Signal Processing technology provides echo cancellation, automatic noise reduction and adaptive volume controlWideband support for best-in-class PC audioOmni-direction microphone for 360-degree room coverageEasy-to-Use FeaturesOnboard mute and volume control functionsConnects to any PC via a standard USB cableCompact and portable, protective carrying case includedHeadphone jack with option for private calls