A system and method is disclosed for enabling individualized software functions in a device. A digital counting circuit is combined, whereby when simulating the mercury column, an auxiliary display of digital change is provided for the user to easily know the value. The motion-vector calculating module computes a motion vector of a macro block that is located in the frame and comprises the line segment. A pointer is located to be selectively engaged with at least one of the rocker arms so that engagement results in the rocker arm’s toothed section being away from the toothed crown, and disengagement results in the rocker arm’s toothed section being engaged with the toothed crown.