Fully working model of a car engine. Electric motor with over 100 parts. Illuminating spark plugs. With "Engine-Starting" Sound Chip. The engine you're about to build is a simplified version of the real thing. Designed to be fun to put together. And helps explain how a full size 4-stroke car engine works. Kit includes all the parts and tools you need to assemble the working model. All you need is a little time, batteries and some vegetable oil! The manual gives clear, step-by-step instructions to guide you through the build process. On/off controller also has a built-in sound chip that reproduces the noise of an engine starting! Uses 2 AA batteries. Approx. 11"x 8"x 7" when assembled. From the Manufacturer For the budding mechanic. Learn to construct a fully working model of a car engine with ignition sound and light up spark plugs. This fun and challenging model is endorsed by Hayes (World's number one publisher of Car Repair Manuals). Kit contains all the tools you need and over 100 detailed and precise parts. Includes electric motor and instructions. Requires two AA batteries (not included). For ages 12 and up.