Model:WOP-35

Features: 

?.The High-Precision Optical Scroll Mouse .
?.2-Wheels and 5-buttons Explorer Mouse.
     (Fourth button:Backward page , fifth button:Forward page)
?.It uses an optical sensor and digital signal processor to read and follow the 
      mouse movements, so it never needs a trackball like a traditional mouse.
?.Scrolling in Windows 95/98/NT/2000/Me and zooming in Office 97/2000.
?.3 programmable button.
?.Windows 95/98/NT/2000/Me driver included.
?.Model Type: PS/2 + USB Port.