When business demands only the best in performance, look no further than the Sennheiser SDW series. With supreme wearing comfort, a wide choice of wearing styles (Headband, Ear Hook, or Neckband), and an ultra-noise cancelling microphone, the iconic design of the SDW series puts it in a class of its own. As voice quality plays a vital part of our day-to-day conversations, choosing the right office headset solution to ensure the communication experience is as close to natural face-to-face conversations as possible is paramount. With a reduction in disruptive background noise, the voice quality for both speaker and listener is dramatically improved, increasing understanding and overall efficiency. Designed with quality components for durability and comfort, our intuitive headset-based call management, generous talk time, easy charging and conferencing abilities make Sennheiser wireless DECT business headsets simply the best tools for the job. Combine these high-performance features with the flexibility of dual connectivity to both desk phone and softphone/PC all to give you have the ultimate in professional business headsets. With purchase of an Sennheiser USB dongle, you can upgrade your device from dual-connectivity to multi-connectivity. Choosing the right SDW: SDW 5015 - This headset is designed for users who require dual-connectivity to a computer and a desk phone to allow them to choose their own constellations SDW 5016 -This headset is designed for users who require dual-connectivity to a computer a desk phone, and a mobile to allow them to choose their own constellations. Also optimized for Skype and all Major UC Brands Sennheiser offers a 2-year on all headsets (including battery).