Enhanced Flexibility: This headset is designed for business professionals who communicate in desk phone and Skype for Business Dual Connectivity: Switch from desk phone to Skype with just a touch on the base station Ultra Noise-Cancelling Microphone: Filters out all unwanted background noise for crystal-clear conversations Fluid Conferencing: Up to 4 headsets can be paired to a single DECT base station for a call, making conferencing as simple as it should be Intuitive Call Control: Answer/end a call, mute the microphone, and adjust volume directly on the headset for added simplicity Active Gard Technology: Featuring patented hearing protection to defend against acoustic shock caused by sudden sound bursts