Building Science Kits: This is an assembly kit of a four-wheel electric building toy that appears to walk and climbs over small obstacles. kids will put together all the pieces step by step according to the instructions. Requires one R6/AA/UM3 battery (Not Included) Educational Toys: This STEM project can help children learn the mechanical transmission structure, inspire their imagination and creativity, improve collaboration and teamwork skills while keeping them entertained for hour Climbing Engineering Toys: The climbing vehicle has 3 chassis adjustment methods for easy handling of various road surfaces. Changing the shaft's attachment position on the wheel will alter climbing ability and stability, and climb over obstacles up to 5 cm with easy Perfect Gifts for Boys & Girls: Awesome activity alone or together with parents, friends, Unique gifts for kids 8 9 10 11 12 year old Safe Materials for Kids: All pieces are sturdy and durable, made with high-quality non-toxic ABS materials, and certified to meet European and American Toy safety standards. It is very easy to wash or wipe all the pieces to make them germ-free