The ITAC Systems Professional Desk Top (PDT) trackball controller is a high duration use computer control and pointing device manufactured with superior materials to endure the long use environments and applications. Stainless steel shafts and bearings and ABS thermoplastic housing construction make this unit extremely durable. The PDT is tough enough to withstand the most difficult tasks, but is also designed to significantly reduce the effects of common repetitive stress injury (RSI) syndrome caused by wrist and elbow powered mouse devices. As much as a 60% improvement in RSI can be realized with use of the PDT. Integrated hand support virtually eliminates the threat of carpal tunnel injuries as well. PDT provides high speed, accurate and highly precise operation under the most challenging conditions.