The CST Micro Trackball is a deceptively simple device that will change the way you interact with the digital world. Housed in high impact ABS casing to prevent any gravity assisted damage, the large trackball in the center is surrounded by three easy access buttons, all of which are fully programmable. The arrangement begins with left click with the left button, right click with the right button, and Scroll-Lock or Drag-Lock with the middle button, but you can mix that up to find your specific preference.