The SP 20 is designed for Unified Communications business professionals on the move using softphone via PIC, mobile phone, or tablet. Users who travel light and demand excellent conference sound will appreciate its user-friendly functionality and exceptional design. Compatible with major UC providers and softphone brands such as Skype for Business, Avaya, Cisco, and IBM. Features include:-Outstanding Communication: Sennheiser voice clarity, echo cancellation, and dual talk function ensure a cleaner sound and a more natural conversation flow.-Enjoy music: sound-enhancement profile for music lets you take a break between calls to hear music or podcasts when you want to relax-Iconic Design: streamlined styling, superb finish, and a lightweight, compact design signal high-end quality wherever you choose to make your office-Exeptional Sound: replace PC and mobile phone speakers and microphone sound with legendary Sennheiser sound quality-Maximized UC Performance: SP 20 is compatible with leading UC platforms with a plug-and-play experience-Easy Usage: easy to use, accessible microphone mute button, call and volume controls - plus practical and convenient cable management system