Included: This is an assembly kit for an electric walking T-Rex building toy with detailed instructions and required parts inside, requires one AAA battery (not included) Educational Toys: This STEM project can help children learn mechanical transmission structures, and stimulate their imagination and is also perfect for 3-7 years old kids to assemble with the help of adults Electric Mechanical T-Rex Toys: Flip the switch, and the dinosaur will walk forward, wave its claws and tail, open its mouth, and its wings have two forms Perfect Gift for Kids: Activity alone or with parents, friends, unique gift for 8 9 10 11 12 year old boys Safe for Kids: All parts are sturdy and durable, made of high-quality non-toxic ABS material, and certified to meet European toy safety standards. Easy to wash or wipe all debris to make it sterile