This assembly kit creates a model which moves on two smaller front and two larger rear wheels swiveling to the right when it meets obstacles such as walls. This unique movement is produced by the crown gearbox which moves the front wheels. Swivelbot moves forward when the way ahead is clear and when it hits an obstacle the front wheels stop and the crown gearbox turns to the right until the way is clear again. This model features a unique rounded body with semicircular bumper and front/rear wheels molded in light violet ABS resin. The top antenna also moves. ?Includes everything needed for easy snapfit/screwtogether assembly. Comes with stickers to decorate the model. ?Length: 102mm width: 90mm height: 82mm. Includes mini motor and requires AAA