Item Type: Stirling Engine Model Material: Iron Weight: Approx. 552g / 19.5oz Product Size: Approx. 16x8.8x12cm / 6.3x3.5x4.7in Luminous Color: RGB Purpose: Desktop Decoration Suitable Crowd: Suitable for people over 8 years old, children under 13 years old need adult supervision. Package List 1 x Stirling Engine Model 2 x Lamp Chip 1 x Blue Cap 2 x Accessory 1 x English Manual 1. Please allow 0& 8209;1 inch error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. 1Simple operation, filled with 95% ethanol and ignited. After a few seconds of preheating, the flywheel rotates quickly and smoothly to light up the LED bulb mounted on the small generator. 2It is a vivid model showing basic principles of external combustion engine, in order to enlighten and explore more scientific knowledge for children's science projects and physical mechanics learning. 3This engine model is also a well designed and well made mechanical toy, suitable for people of all ages and all walks of life, and is an excellent birthday gift. 4It can be used as a teaching tool to demonstrate how to convert energy (heat) into mechanical work, with visual texture and beautiful appearance, and is a good decorative ornament. 5The shaft joint is connected by ultra accuracy miniature bearings, which has good stability, does not require lubrication, and is easy to assemble. With soft rubber pads at the bottom, which is convenient for desktop placement.