An electronic amusement device and a method for operating the device are disclosed. In the method of the present invention, the user guides an automatic navigation device to learn and plan a navigation path; next, the automatic navigation device navigates independently and uses ultrasonic signals and computer vision to detect the environment; then, the automatic navigation device compares the detected environment data with the navigation path to amend the physical movement track. Files are assigned a degree of membership in fuzzy variables and mapped onto a multi-dimensional control surface to determine which files should be sent or acquired first. The main unit further includes sensors for sensing movement of the control stick. A method of use includes the following. with the longitudinal axes of the segments perpendicular to directions of the rolling and sieves the segments for separating conductor material from the segments and, thereby, recovering the conductor material.