The Targus USB (Universal Serial Bus) Notebook Mouse Internet Phone is a portable accessory that works as both a notebook mouse & a USB (Universal Serial Bus) phone. Compatible with MSN, Yahoo, Google, Skype & Vonage. This product has 2 operating modes: mouse mode & phone mode. Mouse mode works exactly like a standard 3-button USB (Universal Serial Bus) optical mouse whilst phone mode is activated when the phone rings through the mouse to answer the incoming call. When the phone rings simply press the answer key & pick up the mouse/phone to answer the call or indeed press the scroller wheel to activate the speakerphone. A built-in headphone connection is also provided if the user prefers to use a headset.