Plantronics Calisto 610-M Portable USB Speakerphone Optimized for Microsoft Lync, Skype and UC 201859-02 Portable PC speakerphone for instant anywhere conferencing Designed for ease of use and portability Simplified call management with an easy interface Ideal for team calls in small and medium-sized work areas The Plantronics Calisto 610 is a corded USB speakerphone for plug-and-play conferencing convenience.