Features: 3 Buttons Optical Wheel Mouse. Blue Light Technology – scrolling wheel with bright blue luminance. Ergonomic Design for Left and Right Handers – confirms to the shape of your hand for optimal support and comfort. It fits any size of hands and you won’t feel tired even a long time used. These elegant and fashion mouse design brings you a most modern lifestyle. Optical Sensing Technology – the latest optical technology. The advanced optical sensor allows high speed movement and pinpoint accuracy on almost any surface. Quiet Scroll Wheel – for smooth, quick web and document scrolling or zooming. Step-n Scroll Wheel Design. Superior Navigational Control.