The Orbit Wireless Trackball with Scroll Ring continues the success story of Kensington Trackballs. This trackball features a patented Scroll Ring that allows you to effortlessly scroll up and down, customizable buttons, dual wireless connectivity (2.4 GHz, Bluetooth 3.0 and LE) with 128-bit AES encryption, four DPI settings (400, 800, 1,200, or 1,600) for easy adjustment of cursor speed to meet your needs, a detachable wrist rest, an ambidextrous design, and plug-and-play functionality for Mac or PC.