Mobile Unified Communications: For professionals using Skype for Business, who require a consistently excellent hands-free communication solution | Dual Connectivity: Switch seamlessly between two connected Bluetooth devices (cell phones, softphones, desk phones, etc.) for premium call flexibility | Seamless PC/Softphone Connection: With the included dongle, connecting to a PC/Softphone has never been easier | HD Sound: Powered by a neodymium speaker for legendary Sennheiser HD sound to ensure a clearer and more natural audio experience | Ultra-Noise Cancelling Technology: Filters out all unwanted background noise for crystal-clear conversations | Extended Talk-time: With up to 15 hours of talk time, you can always stay focused on your conversations | Peace of Mind: With a 2-year warranty on all headsets (including batteries), you never have to worry about the quality of your bluetooth headset | All-Day Use: Designed to last an entire working day, featuring extra soft leatherette ear pads and headband padding for maximum wearing comfort | Sound Enhancement Profiles: Automatically adapts and optimizes sound for both communication and multimedia/music purposes | ActiveGard Technology: Ensures protection against acoustic injury caused by sudden sound bursts on the line