Kensington Orbit Optical Trackball Mouse, USB 2.0, Left/Right Hand Use, Black/Silver (64327)

If you're looking for a simple way to transition from a mouse to a trackball, trust the Orbit Optical Trackball. It offers better ergonomics, with less wrist and hand movement to ease repetitive-stress injuries. Optical tracking technology delivers precise cursor control and the two-button design provides a familiar experience for mouse converts. Connector/Port/Interface: USB 2.0; Left/Right Hand Use: Left/Right; Mouse Technology: Optical; Wired/Wireless: Wired.