The kit can be assembled into a fast train.It's not the kind of blank building blocks， they will moveunder sunlight! No batteries are required. When sunlightshines on solar panels， the small toys get sun power andmove.Teachers and parents can use the toys to teach children thebenefit of solar energy， let them have great joy， nurturetheir imagination & creativity and allow young builders tofocus on self-motivation， perseverance and manipulation.It¡¯s easy to assmble the parts， so children can learn bythemselves and have sense of accomplishment at the same time.The solar bullet train is an excellent beginner building kitdesigned to teach how solar power is used to drive a smallmotor.Can work well not only in sunny days， but also in rainy daysor at night by using a 50 watt halogen light to replace solar one.)A good teacher and helpful friend for kids. (Recommended for ages 10 and older.)Constituent part: engine， carriage and cabooseSuitable for: Ages 10+Material: Durable plastics Included:Principal part fittings X 1Sticker X 1Mechanical parts X 1(set)