Mad Science - Hydraulic Robot Arm Control the Robot Armpowered by water alone Robot Arm only needs a few pumps to energize the cylinders and power up (no batteries needed) Robot Arm moves up, down, left and right - claw grabs, drops and squeezes Includes cones and challenges to test your contro Mad Science introduces children to Science and Discovery while sparking their imagination Mad Science encourages science literacy in children and lays a foundation for future success