Haynes Jet Engine Kit: What is it? It’s a scale model of a 2-spool turbofan jet engine… that works! &, with its clear casing, you can see how all the parts move inside it. Plus, it has an electronic jet engine sound & light-up condensation chamber. About the product This build-it-yourself kit has everything you need to construct the engine, including all the parts, screws, & a screwdriver. Oh, & detailed, step-by-step instructions with diagrams. How is it powered? There’s no need for jet fuel. This model engine runs entirely off 3 AA batteries, which aren’t included. Why you should buy it It’s a super-fun project that teaches you how jet engines work. It’s great STEM learning & is sure to take future pilots & plane fans to new heights of enjoyment!