mVox USB Speakerphone Noise-Canceling USB Speakerphone Kit for Free VoIP Calls. To hear and be heard loud and clear with this portable, plug-and-play USB speakerphone kit. Includes USB speakerphone and earpiece. It is the perfect handsfree speakerphone for small group conferencing or individual calls via IP softphones, such as Avaya IP softphone, Note: The MV100 is not compatible with Microsoft Windows Vista and Mac OS 10.3.9 or higher! The MV100 is a high quality USB speakerphone with advanced noise suppression and echo cancellation technologies. AIMPhoneline, Skype, Yahoo Messenger, MSN Messenger, and Google Talk.