description:...with the 800dpi optical resolution, even if you use it for a long time, you will still feel comfortable with the NetScroll 10features:Enhanced precision with 800dpi optical engine, eliminates moving parts and dust accumulationComfortable fit for either hand and for long-term useThe metallic-black color matches your PC environmentsystem requirements:IBM PC Pentium 233 compatible or higher with Windows 2003/XP/Me/2000/98SEavailable USB -portpackage content:NetScroll 100 USBspecifications:- body weight: 100g- body size: 115x55x35mm- gift box size: 95x40x130mm