INSMA MINI 4-wheel Windmilling DIY Robot Smart Car Chassis Kits Car Model and Battery Box Combinations: DIY Robot Smart Car two on the 5th battery box without lid + propeller 75X2cm (black) Battery-powered by the wind can push trolley travel (batteries not included) Splicing process may need to use glue, the proposed purchase of 502 or UHU glue Educational toys, help to improve the ability of children, suitable for young people at key stages of heart development Can improve the child's interest, through to produce their own works to improve children's self-confidence and sense of accomplishment