Optimized for Unified Communications with DSP (digital signal processing) and echo cancellation. Features a USB connection that plugs directly into a USB, plus in-line mute and volume control. 2 speakers to help block out distractions and help to keep focused on calls. Improved noise canceling microphone ensures the application hears precisely what you say. Lightweight and durable, monaural over-the-head wearing style for all day use. Flexible microphone boom stays in place; for consistent, optimal voice quality. Plug-and-play ease of use means no drivers or software to install. Compatible with Microsoft Windows 7, Vista, XP, 2000 and Macintosh OS 9.1 and higher. 2-year warranty