Building Science Kits: This is an assembly kit of a four-wheel electric building toy which appears to walk and climbs over small obstacles. kids will put together all the pieces step by step according to the instructions, including simple fastening, screwing assembly and simple wiring to complete assembly. Requires one R6/AA/UM3 battery (Not Included) Educational STEM Toys: This STEM project can help children learn the mechanical transmission structure, inspire their imagination and creativity, improve collaboration and teamwork skills, support logical thinking and problem solving while keeping them entertained for hours 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, grandparents or friends to build an endless array of eye catching model. Unique gifts for kids 8 9 10 11 12 year old and up for Children's Day/Birthday/Christmas/Halloween/Holiday/Back to School 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