Easy Navigation and Space-Saving - The surface on the high-density trackball is coated with a special treated glitter effect providing users exceptional tracking and precision as well as having a pleasing aesthetics. Everything on the screen is within the reach of a small thumb movement without having to move your arm and it saves space in your work area. Adjustable Angle - Unique detachable risers to customize the angle of the mouse from 0 to 10 or 20 degrees for each user’s different needs to minimize strains on wrist and arms Tilted-Scroll-Wheel - The scroll wheel features a middle click function as well as horizontal and vertical scrolling for a quick and convenient browsing experience. Wireless Dual Mode - Seamlessly switch between two devices via Bluetooth or wireless 2.4 GHz connection perfect for multiple devices. Dimensions - 5.47 x 4.06 x 1.97 inches DPI - 600/1600 System Requirements - Window 7, 8, 10 and above