Features:DIY building block assembly experience.Deformation, electric, competitive, interactive.understand the mutual coordination and interaction of mechanical transmission structureLearning to understand the kinematics of the principle of motion and conversion.Products have 2 speed for the exchange.Children experience in assembling interaction, develop their problem solving process work skills, ability of exploration and innovation. Help children to build self-confidence and innovative thinking ability and intelligence development and training.Product unique technology education selling point (to cultivate childrens ability to grow a variety of processes)1.ability to learn, explore and innovate;2.independent thinking and hands-on mental problem solving skills;3.understand the mutual coordination and interaction of mechanical transmission structure;4.understand the principle of motion and dynamic transformation;5.understand the mechanical power, electric power, solar energy, wind energy, chemical energy generation and interaction and mutual enhancement of the transfer of the child in the physical, mechanical and chemical changes, new energy and other aspects of the understanding and exploration.Specification:Material: ABS plasticColor: greenSize: 1 100*95*160mm 2 110*90*100mm 3 90*125*123mm 4 90*100*92mmPackage Size: 315*195*70mmPackage Included:3 x Plastic parts1 x motor connector1 x battery box connector1 x adhesive tape1 x white wire4 x screws2 x gears1 x six angle shaft1 x small gear1 x shaft gear