If youre looking for a simple way to transition from a mouse to a trackball, look no further than the Orbit Optical Trackball designed for both Windows & Mac. It offers better ergonomics, with less wrist & hand movement that will ease the pain of repetitive-stress injuries. Optical tracking technology delivers precise cursor control at the touch of a finger while the ambidextrous, two-button design provides a familiar user experience for mouse converts. Trackball Works software, a free download on Kensington.com, offers you the ability to assign specific button functions & create a customized productivity experience.