completion or team cooperation]The stem toys manual contains complete product introduction, safety warning, operation specification, game introduction, installation graphic steps, and the important scientific knowledge and principle . We have made the perfect preparation for everything. Children can complete it independently, cultivate a tough character, and also work in a team to let them understand the importance of team cooperation.[Move your hand and discover science]What is a series circuit? What is the principle of work? How to match the combination of acive wheels, driven wheels and idler wheels? Go ahead, little scientist [STEM Circuits and Mechanical Science Kit]STEM toys 36 precision parts and detailed product manuals, allowing kids to combine circuits and gears by hand to create amazing mechanical structures and circuit combinations. (excluding AA batteries)[DIY science set] Through the simple connection and installation of building blocks, exercise children's hands-on ability and logical ability, and principles. Drawing tool experiment can draw 48 different patterns, give full play to children's , and feel the of drawing tool experiment.Type: Bcolor:As shownMaterial:plasticPackage Contents:1 x science kitsOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.