[AUTOMATIC DIRECTION CHANGE] Due to the shape of the sphere and the self-balancing system, the ball automatically changes direction when it collides with a wall, chair, door, etc. No additional help is required, just turn the ball on to play and turn off when your pet runs out of energy and is done playing. [ATTENTION] The ball of interactive cat toys rolls better on hard floor, but may not roll well on thick carpet, please purchase with attention. Please do not play in the stairwell to avoid damage.