Combining the patented optical trackball technology with the new Cursor Controls Ltd hall-effect scroll wheel to provide a water resistant desktop trackball solution, the E38 Desktop module is an extremely high specification device. To compliment these two technologies, the module also includes left, middle, and right switch functionality as found in all conventional desktop trackballs/mice, making the E38 Series module a complete human interface solution for control of a cursor. The unit has been designed to be a free standing desktop device and therefore optimizes desk space when compared to a mouse.