Ergonomic design , it can b used by both left and right hand according to people using habits.High definition optical engine, active more smooth and accurate cursor control.Small and exquisite design convenient to carry, makes you free to work on the computer.More than 3,000,000 times key life, more durable.No Noise wheel technology, making a peaceful working environment.System supported windows 2000/XP/Vista/Windows7"}]