8 years & up. From cell phone buzzers and toys to pavement compactors and industrial movers and sorters, vibrating motors are found in countless devices and machines. With this kit, children can build seven different models centered on a vibrating motor that demonstrate real-world uses for these energizing machines. Experiment by building unique structures! The vibrating motor and specially designed legs and feet allow the models to move around simply with oscillating motion. Encourages creative thinking. Includes a 24-page manual. 80 pieces.