KINAMAX MS-UOPT High Precision Ergonomic USB 3-Button 3D Optical Scroll Wheel Mouse - USB ready, Plug-n-Play, and Hot Pluggable! This USB Optical Mouse with 800 DPI is an excellent tool for professionals. The 800 dpi resolution offers twice the accuracy of standard mice, and is ideal for graphics and web designers who demand pinpoint accuracy. It is stylish, lightweight, extremely comfortable, works on most surfaces, and needs just inches for accurate movement. The ergonomic contour design offers comfortable use for hours; moreover, its greater speed reduces excessive and potentially harmful arm movement. Its optical technology provides precise tracking on almost any surface. Just plug into the USB port and its works within seconds. The Roller Button can be used for fast browsing up/down, left/right on the internet in Windows documents. High precision optical sensor sends 1,500 signals per second to digital signal processor to determine exact location, so it never needs a mouse ball like a traditional mouse. USB Cable Length 5 feet Requirements: Windows 98/98SE/2000/Me/XP