VAIO USB Mobile Optical Mouse Silver 800DPI Resolution Stylish Design - Elegant and ergonomic design, coordinates perfectly with VAIO(R) FS Series Notebooks Precise Control - Innovative low-friction and non-stick PTFE sole provides smooth and precise control Easy-to-Use - Three touch points, comfort and support mouse control Requires - Microsoft Windows XP Professional, Windows XP Edition, Windows Millennium Edition, Windows 2000 Professional pre-installed model Optical Sensor