User manual here

The ‘Optima’ -is a desktop trackball using durable optical technology for precise control of the cursor.

With silky smooth ball movement, large, stable footprint and low profile the ‘Optima’ does not require fine motor skills and is ideal for a wide spectrum of computer users.

Robustly manufactured with no mechanical wearing parts the ‘Optima’ is maintenance free and will give years of untroubled service.

• Robust construction and ergonomic design
  
• Durable optical technology with no mechanical wearing parts
  
• Precise tracking and cursor control
  
• Large free-running ball requiring only the lightest touch
  
• Silky-smooth ball movement
  
• Large footprint for stability
  
• Low profile providing a natural hand rest for comfortable operation
  
• Left/Right and drag lock buttons
  
• Colour coded buttons mounted sub-flush to prevent accidental activation
  
• Sockets to operate left/right click buttons from remote switches
  
• Auto Detecting PS2 and USB protocols
  
• Easy plug and play installation (no additional drivers required)
  
• PC and Mac compatible