Provides you with wireless convenience and the freedom of a smooth connection for up to a 30-foot range without tangled cables. Designed with a wrist-friendly contour support. Two internet buttons are conveniently located on the side of the mouse for Back and Forward page browsing. The 800/1200/1600 switchable DPI button on the top provides three levels of mouse cursor speed that is useful in different environments. The advanced Optical Sensor technology keeps the mouse precisely on point and lets you work on most glass wood marble and leather surfaces without a need of a mouse pad.