This is a kit and assembly is required.- Size approx. once assembled : 102mm x 90mm x 82mm- with mini motor and a marking sticker- using one AAA battery (Not included)Equipped with two front wheels with a large diameter and two rear wheels with a large diameter, it automatically turns to the right when it hits an obstacle such as a wall.The secret of movement is the crown gearbox that moves the front wheels.Normally, power is transmitted to the front wheels to move forward, but when the front wheels stop on a wall, the gearbox itself rotates with the front wheels.The car body automatically turns to the right and moves forward again when there are no obstacles.