Adopting high-resolution 1000DPI optical engine. Accurate optical navigation technology. The movement is more stable,the positioning more accurate. Encoder Scroll technology, durable and comfortable non-slip wheel design. Ergonomic design, feel more comfortable, Applicable right-handed and left-handed man. Can run on more surfaces smoothly. System Requirements: Applicable IBM or compatible personal computer. Based on the Microsoft Windows operating system computers: * windows Vista Official version * Windows XP Home Edition or Professional Edition * windows 2000 Professional or Server Edition * windows ME or Windows98 Second Edition * available PS / 2 port or USB port.