Have total command of your Hydraulic Robot Arm, using the scientific principles of this hydraulic system. This 229pc kit has easy-to-follow instructions with detailed graphic illustrations. A great inclusion to any engineering, science and mathematics learning strategy. No batteries or motor required - it is powered by water, creating the hydraulic aspect of the toy and its ability to be controlled by levers. Recommended Age: 10yrs+. It will also challenge the beginner engineering enthusiasts.