Hydraulics are introduced and investigated with this nifty TEACH TECH kit. Young engineers will be delighted with a new HydroBot Arm Kit. Use levers and the power of hydraulics to actuate the multi axis arm. NO BATTERIES REQUIRED. Powered by water and You, lever controllers have a special braking system that helps to achieve fine, accurate tasks. Grippers can be removed and replaced with suction components to pick up objects with smooth surface areas of no greater than 50 grams (1.75 oz.). Clear, graphic instructions make assembly and operation easy to understand. For ages 12 and up. WARNING: CHOKING HAZARD - Small Parts. Not for children under 3yrs.