The E50 Desktop (Halo and Backlit Buttons) module incorporates LED illumination around the ball and mouse switches making it ideal for use in low light level environments. The device combines the patented optical trackball technology with the new Cursor Controls Ltd hall-effect scroll wheel to provide a fully waterproof desktop trackball solution. 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 E50 Series module a complete human interface solution for control of a cursor.