The X-keys TKB-6015-LBKBK-R L-Trac Trackball utilizes laser navigation technology all contained inside of a high impact ABS molded enclosure. The enclosure is ergonomically designed to fit the contour of the hand which allows for no movement of your arm or wrist from side to side. The trackball accommodates both left and right-handers as well as hands of all sizes. The easy to use trackballs are suited for those with disabilities and physical handicaps. The high-performance laser tracking technology allows for accurately accelerated mouse movement across the screen. With this technology, the L-Trac series has selectable resolution up to 1600 DPI which allows for quick changes in sensitivity.