Compact size and new popular design Mouse combines with USB phone function Can answer Skype calls easily while you are using the mouse In-house design advanced optical mouse and USB phone solution Mouse and USB phone function with high accuracy and reliability Dispensed with mouse pad and reflector board Working with most of surfaces, including wood and plastic USB phone with ringer function, the ringer will ring when Skype in PC-to-PC and PC-to-phone operation Come with drive and easy to Plug-and-play USB1.1 compatible Sound card not required External power not required With built-in speaker Supports Skype, MSN programs, and more Echo cancellation, noise reduction Super long working life Compatible with Microsoft Windows 95/98/2000/NT/ME/XP/ 3.1 Mouse size: 8.8 x 4.9 x 2.4cm