Connects the B200 to the USB port on the computer. For use with computer applications such as speech recognition and VoIP. Communication range between the B200's base and wireless headset is up to 75 feet*.  Compatible with Windows XP, 2000, Me, 98SE, Mac OS 9.1 and higher. Please note that use of the B200 cord will disable the B200's function with your standard telephone. *Certain environmental conditions can inhibit range.