The New Kensington K64325 USB 2.0 Expert Mouse Trackball is a versatile and efficient pointing device for Windows, Mac OS, and other computer systems. Featuring a sleek black and silver design, this trackball mouse offers convenient side-to-side scrolling capabilities. With a compact design of 1.75" height, 9" length, and 5.25" width, this trackball mouse from Kensington is a reliable choice for precise and comfortable pointing control. Its wired connectivity options for PS/2 and USB ensure smooth and consistent performance for your computing needs.