Features: 
Ö.Wireless for freedom while you work.
Ö.Patented two scroll wheels for faster horizontal and vertical scrolling.
Ö.Two transmitters ensure broad angle (up to 160 degrees) of operation.
Ö.Battery-saving mode-powers on and off automatically.
Ö.Scrolling in Windows 3.1/95/98/NT and zooming in Office 97/2000.
Ö.Superior resolution of 520 dpi.
Ö.Works in a 1M range using IR technology.
Ö.3-button(left + right + wheel/side button) + 2-wheel. 
Ö.1 programmable button.
Ö.Windows 3.1/95/98/NT/2000 driver included.
Ö.Model Type:PS/2 Port.