Optimized for Microsoft Office Communicator and Microsoft Lync. A duo speaker headset that offers plug-and-play functionality with Microsoft Office Communicator and Microsoft Lync. Its compatibility ensures a swift deployment and quick user adoption. Employees will enjoy a comfortable headset with a class design. 550 MS Duo pairs with your mobile and laptop at the same time. One can talk for up to 6 hours at a time and get 8 days of standby time. Customers will enjoy clearer conversations, thanks to the wideband audio feature that enhances call clarity.