USB interface, Plug-and-Play, no installation needed. No mouse pad is required, just slide on any surface. Ergonomical design - reduce fatigue effectively Real hardware resolution 1200dpi - better buy for professional designers and game fans. Standard 3 buttons - left key, right key, scroll button included Digital encoder technology, operate precisely, prevent faulty movement effectively Oversized mouse fits for big hands users Operation voltage: DC 5V+/-5 Button dynamics pressure: 60g+/-5g Button life time: 3000000 Resolution: 1200 dpi Operation temperature: -20°C to 80°C Humidity: 10 to 90 percent Dimension: approx. 110 x 80 x 38 mm Cable length: 1.3 meters Compatible with MS Windows 98/2000/me/XP