Extraordinary 3 Programmable (left + right + wheel button) + 1 wheel Buttons instantly fulfils all your special needs, expedite and thoroughly utilize your computer usage time.

Features:

• Advanced design with programmable buttons

• Mini size design, saving your space on desktop and easy to carry with your notebook

• Optical sensor means no tracking ball to clean

• 800dpi highly precision optical sensor

• USB or PS/2 interface protocol