Sennheiser D 10 USB ML - US (506418) Single-Sided Wireless DECT Headset, with Direct Softphone Connection, Noise Cancelling Microphone, and is Skype for Business Certified (Black) Mobile Unified Communications: For professionals using Skype for Business, who require a consistently excellent hands-free, plug and play communication solution Improve Collaboraton: Move freely around the office building, up to 590 feet with line of site, while still being connected to your communication systems Clear Communication: Sennheiser Voice Clarity uniquely enhances the most important sounds throughout the call, providing a more natural-sounding experience for both caller and listener Built-in: Features cable management, magnetic charge interface for secure placement, noise-cancelling technology, and status indicators to show available talk time 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 ActiveGard Technology: Featuring patented hearing protection to defend against acoustic shock caused by sudden sound bursts Peace of Mind: With a 2-year warranty on all headsets (including batteries), you never have to worry about the quality of your office headset USB Connection: No need to find an outlet, simply plug the D10 directly into your device with the included USB Cord and you're ready to go High-Speed Charging: Communicate all day worry-free with up to 12 hours of talk time and 50% charge in 20 minutes Differentiation: Never confuse your ringtone with your neighbor's again with the choice of 3 unique ringtones