Feature:
4 way scroll panel  
                     
Slide slightly for Up/Down/Right/
Left direction 
                       
Scroll Free

Perfect for viewing images and
large documents.

Increase 25% working efficiency

Specifications:
Interface: USB
Resolution:800 dPI
Mouse Buttons:0 Buttons
Micro Switch:1 million cycle life
Encoder: Opto-Mechanical
Browse way:
special mechanism to support
4 direction rolling
(Up/Down/Left/Right)
Driver compatible with:
Windows 98/ 2000/ ME/NT/XP and above
Product size:
102(L)*55.5(W)*30(H) mm

Approval: CE;FCC;BSMI

Note:
Optical mouse may not work
properly on mirror or glass.