Computer mouse Five programmable buttons design: two buttons and one scroll wheel on the surface, and two buttons on the side point for page front and back which is default Resolution rate?800dpi or 1000dpi, twice the speed, twice the accuracy Usb interface, compliant with usb 1.1/2.0 specification Usb powered, no battery needed No interference even many mice being used at the same time Reliable optical tracking sensor on almost any surface Support plug-and-play No driver required One ps/2 to usb adapter included, add one more available usb port for your pc/laptop Os: win 98se/ me/ 2000/ xp Dimension: 120mm (l) x 70mm (w) x 30mm (h) Color: silver Dimension: 120mm (l) x 70mm (w) x 30mm (h) Color: silver