The patented shape supports your hand in an upright neutral posture that generally avoids forearm twisting. Many users, including medical doctors, ergonomists and physical therapists, said the Evoluent VerticalMouse provides superior comfort and even relieved their wrist pain.
                                                                             
                                    
                                        
                                                                                               General Information 
  Manufacturer:  Evoluent, LLC
  Manufacturer Part Number:  VM4S
  Manufacturer Website Address:  http://www.evoluent.com
  Product Model:  4 Small
  Product Name:  VerticalMouse 4 Small Mouse
     Pointing Device 
  Pointing Device Connectivity Technology:  Cable
  Movement Detection:  Laser
  Number of Total Buttons:  6
  Number of Programmable Buttons:  6
  Scroller Type:  Scroll Wheel
  Pointing Device Features:  Ergonomic
  Ergonomic Fit:  Right-handed Only
     Interfaces/Ports 
  Pointing Device Host Interface:  USB 2.0
     Miscellaneous 
  System Requirements:  
Operating Systems:
- Windows XP
- Windows Vista
- Windows 7 32/64 Bit
- Mac OS X
Device Supported:  Computer