This product brings all the precision and durability of IntelliEye Optical technology to a simple, affordable mouse. It throws out all the old, mechanical technology used in current mice because this technology quickly loses its accuracy due to wear and the accumulation of dirt. Wheel Mouse Optical instead uses the optical sensor called IntelliEye. This sensor scans the surface beneath the mouse 1, 500 times per second to track the smallest motion, accurately and crisply. It works on virtually all surfaces (ie no mouse pad required) and stays precise because there are no moving parts to wear out or stick. Wheel Mouse Optical is simple to use even though it contains such advanced technology inside. It has the standard two mouse buttons, plus a wheel for easy scrolling. Its ergonomic shape is designed to be comfortable for left or right-handed use, and for people with small or large hands.