Sennheiser MB Pro 1 UC (506042) - Single-Sided, Dual-Connectivity, Wireless Bluetooth Headset | For Desk/Mobile Phone & Softphone/PC Connection| w/ HD Sound & Major UC Platform Compatibility (Black) Mobile Unified Communications: For professionals who require a consistently excellent hands-free communication solution for phones and all UC platforms (Cisco, Avaya, IBM, etc.) 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