Plantronics Blackwire Stereo Over-the-head Lightweight Noise-canceling Hands-free PC USB Headset with Comfort Fit Wideband Headband Smart Sensor Technology & In-line Call & Volume Controls For Microsoft Office Communicator Smart Sensor technology lets you answer a call by simply putting on the headset One-touch call answer/end, volume +/-, and mute PC wideband audio with noise-canceling microphone Dynamic EQ automatically adjusts audio settings between voice calls and music Optimized for use with Microsoft Lync 2010 and Microsoft OCS 2007