Features Digital wheel keys switch technologyThe wheel provides easy scrolling and added convenience of an extra buttonErgonomic design to supports the contour of palm for both right & left hand userSolid-state Optical Navigation Technology provides superior precision and smooth navigation and beca use of its no moving parts design, no maintenance required even after long time useHigh performance, comfortable designAmbidextrous for left and right Hand Use Advanced Optical sensor for Accurate positioning Ergonomic design for smooth trouble free operation