Trackballs are pointing devices which allow users to control the screen-based movement of a cursor or icon on an industrial computer monitor. They resemble an inverted mouse and feature a pointing ball that is rotated with the thumb, fingers, or palm of the hand.  Unlike mice, trackballs remain stationary and do not require much space. There are several main trackball configurations. Desktop devices are enclosed or encased and suitable for benchtop or tabletop applications. Handheld and miniature trackballs are also available. Keyboard-mounted products attach to a computer keyboard. Panel-mounted products include a flat frame or adapter plate that fits the top or front surface of an instrumentation or equipment panel. Original equipment manufacturer (OEM) kits do not include an enclosure, case or front-panel adapter plate. Instead, these trackballs consist of a silicone rubber overlay, printed circuit board (PCB), controller, and connecting cable.