Trust 2-in-1 Optical Trackball TK-2500p USB Trackball Black mice

2-in-1 Optical Trackball TK-2500p -4 button optical trackball with integrated numeric keypad and retractable cable;
-Ideal for notebook users: more comfort than a ordinary built in touchpad and easy to use numeric keypad;
-Convenient integrated numeric keypad to take full control of your spreadsheet and database applications, like Excel or Access;
-Ergonomic design foldable stand at the bottom providing best working position;
-3rd and 4th button to easy navigate back and forward in your Internet browser;
-High quality advanced optical sensor providing motion control with high precision;