Blackwire C210-M Headset is optimized for Microsoft Office Communicator 2007. With simple call controls for a convenient hands-free environment, the corded Blackwire C210-M makes PC voice communications more effective and productive. Delivering full wideband audio, Hi-Fi stereo and USB-enhanced digital sound, the corded Blackwire C210-M was designed to economically provide the best PC voice and audio available for large, enterprise-wide deployments.