A Great Gift for 8-12 Years Old:Create unique STEM Toys for 8-12 years old & teens. Easy to assemble: Includes 1 mini screwdriver and detailed instructions make it much easier and convenient to assemble the stem kits. Requires 2 AA batteries.(Not Included) Manufacturered by Poraxy. Complete All in One Kit:Contains 5 set module partscan be build Running robot Robot Tank Whirligig Boat. 100% SATISFACTION GUARANTEE: Contact us if you are not satisfied with it for any reason. And we promise all the issue will be solved within 24 hours. Specially STEM education LABS Kit:The 5 erector set are designed to enhance children's Science Technology Engineering and Math skills.