The Kensington Orbit Trackball with Scroll Ring is a black and blue trackball mouse designed for optical tracking with a maximum DPI of 400. It features a scroll ring for added convenience and has a wired USB connectivity for easy use. This trackball mouse has a sleek design with dimensions of 5.11 inches in length, 4.78 inches in width, and 1.50 inches in height. It comes with a 1-year manufacturer warranty and offers precision control with its 2 buttons and optical tracking method. Perfect for those looking for a reliable and efficient pointing device for their computer setup.