The USB-PS/2 Optical Mini Mouse is a small, ergonomic, stylish, optical screen scroller mouse, perfect for the road warrior who needs to save space. Unlike a traditional mouse, the USB-PS/2 Optical Mini Mouse doesn't use a tracking ball. It uses an alternative optical sensor and digital signal processor to read and follow your mouse moves, eliminating erratic cursor movement. You can also use the 'Screen-Scroller' wheel to scroll up, down, left or right and alternate between open applications. The mouse offers a standard USB connection for true plug and play functionality and a USB to PS/2 adapter.