| 2.4Ghz wireless USB receiver (applies to wireless models) | 
| Adjustable dpi settings for smooth cursor control | 
| Adjustable dpi settings for smooth cursor control and precise tracking (800 dpi, 1200 dpi) | 
| Adjustable dpi settings for smooth cursor control and precise tracking (800, 1200, 1600 dpi) | 
| Adjustable sensor sensitivity to suit you | 
| Clickable scroll wheel | 
| Clickable scroll wheel is ideal for speeding through documents | 
| Colour Black | 
| Dedicated back/forward thumb buttons for web browser use | 
| Dedicated thumb controlled back and forward web browser navigation | 
| Dedicated, thumb controlled, back and forward web browser navigation reduces time required to complete web browser tasks | 
| Easy USB Plug & Play setup - no installation required | 
| Ergonomic design matches natural hand curvature | 
| Ergonomic design matches natural hand curvature maximising comfort during prolonged use | 
| High definition optical sensor delivers smooth cursor control | 
| High definition optical sensor delivers smooth cursor control and precise tracking | 
| High definition sensor provides smooth and sharp cursor control | 
| Pack of 1 | 
| PC and Mac compatible | 
| PC and Mac? compatible | 
| Plug & Play operation with USB connection | 
| Professional black and blue corporate finish complements Pro FitT keyboards | 
| Reliable Plug & Play operation with USB connection | 
| Requires 2 x AA batteries (included) | 
| Sculpted body with soft rubber panels provides comfort and grip | 
| Sculpted side panels with soft rubber panels and contoured buttons maintain comfort and grip | 
| Secure 2.4Ghz wireless technology | 
| Secure 2.4Ghz wireless technology reduces risk of interference and is ideal for office environments | 
| Secure 24Ghz wireless technology reduces risk of interference and is ideal for office environments | 
| Secure wireless connection reduces interference to improve control |