This original science kit is a laboratory that lets you build a real walking robot that never falls over the edge! When placed on a table, this advanced robot detects holes or open spaces beneath it. It stops and changes direction as soon as its rubber wheel detects that the area underneath is no longer there! The top part of WalkingBot's body is transparent, allowing you to see its internal gears and show children the mechanism that enables the robot to move. Recommended age (years): 8+ Number of batteries required: 2x AA (not included) The following warnings apply to this product: Warning! Not suitable for children under 36 months. Warning! Use under the direct supervision of an adult. Warning! Contains small parts. Choking hazard! Warning! Please observe the manufacturer's battery and disposal instructions.