The special ergonomic vertical design, with a soft rubber grip, offers a unique and comfortable user experience. Three convenient buttons on the side allow intuitive control for faster back and forward browsing navigation. In addition, there are four levels of DPI (400/800/1600/3200) available. The laser sensor technology allows precision in pointing while letting you work on most surfaces, such as glass, wood, marble, or leather. This eliminates the need for a mouse pad and gives you more control.