Improved & updated features: Spill-resistant construction protects from accidents. Adjustable legs encourage more comfortable wrist posture. Quiet key strokes take the clattering out of typing. Plus, plug-and-play USB instantly connects. Quality mouse included: 3 buttons promote productivity. Contoured shape keeps your hand comfortable. High resolution optical sensor (1200 dpi) works on most surfaces. Scroll wheel gets you there fast. Plus, rubber side grips feel great to the touch.