Features and benefits Clear explanation of the fourstroke singlecylinder gasoline engine: plainly demonstrates the basic working principle and the main structure of a typical singlecylinder engine, helping students understand how the engine operates. Educational purpose for middle school classrooms: specifically designed for teaching demonstrations of heat engine parts in physics classes, supporting classroom learning and assessment. Visual, intuitive learning aid: equipped with a light display that runs on a 1.5volt power source. When the mechanism operates, the lights flash in sequence to vividly illustrate intake, compression, ignition/combustion, and exhaust actions. Realistic, visible layout of engine components: the left side features the flywheel, while the right side houses the crank timing gear and the camshaft timing gear, enabling observation of key timing relationships during operation. Specifications and design notes Function: educational demonstration device for fourstroke singlecylinder gasoline engines and their main components. Power and display: light display device powered by 1.5 V; sequential lighting synchronized with engine motion to highlight cycle steps. Size and form: compact instrument designed for desktop classroom use, suitable for demonstration in standard physics labs. Construction and usability: built as an educational teaching aid with straightforward, observable parts to support handson learning and discussion. Use scenarios Classroom demonstrations: ideal for teacherled explanations of the fourstroke cycle and engine anatomy during units on heat engines and energy conversion. Science fair or student projects: a tangible model that helps students visualize engine timing and operation for project reports and oral presentations. Tutoring and selfstudy: supports individual or smallgroup study by providing a clear, visual reference to reinforce theoretical concepts of engine mechanics and timing. Notes The device emphasizes function and educational value, providing a straightforward, reliable tool for physics instruction without extraneous features.