ITAC Systems Mouse-Trak evolution is the most highly evolved mouse available today designed for use in ergonomic workstations by the most demanding power users.??This mouse features elevated integrated hand support for maximum stress reduction and six large keys positioned to fall under the fingers. The four most heavily used mouse actions are available on keys next to the ball, which helps those with small hands. With the evolution mouse you can click, double-click, click and drag without complicated driver setup. Advanced users can reprogram the keys for single stroke click, double-click, or click & drag for any of the three industry-standard mouse keys without special drivers. The mouse can be configured for left or right-handed users and is protected by reliable stainless steel shafts and bearings.