Califone X-keys O-Trac Dual USB PS/2 Trackball Black

Enjoy smooth, effortless control with the beige O-Trac Trackball from X-keys. Offering PS/2 connectivity via a built-in 120\" cable, the O-Trac provides a large, high-density trackball paired with stainless-steel rollers inside a high-impact ABS molded enclosure. The enclosure is ergonomically designed to fit the contour of the hand so you can control your cursor without side-to-side movements of your arm or wrist. The trackball accommodates left and right hands of all sizes, and is suited for users with disabilities and physical handicaps. The faster you turn the trackball, the faster the cursor will move across your screen.