With 4M Kidzlabs Green Science Salt Water Power Robot you build a miniature robot that is powered by salt water. With just a drop of salt water, the robot can move. No batteries are needed! The package contains mechanical parts, carbon paper, aluminum foil, fabric, motor, dropper, screws, wheels and detailed instructions. Required but not included: table salt, water and a spoon Suitable for children from 8 years. Box dimensions: 24 x 22 x 6 cm Dimensions assembled robot: 8 x 6 x 6 cm