The Weasel is a tenacious little robot warrior that embodies two sensors that allow it to “see” a line or “feel” its way along walls and around corners. The two motors and contact sensor activate the wall sensing micro switch to control the motors’ on/off operation that determines the path of a wall. An excellent beginner robot, the Weasel also includes a sonic tracking system. Phototransistors located underneath the robot’s sturdy plastic base enable it to detect and follow a black line. It also features a three-speed gearbox that will help navigate at the velocity you determine.