Feature:1. Simple operation, all you have to do is take it out of the box, fill it with 95% ethanol and ignite it, then, after preheating for a few seconds, let the flywheel rotate , it will rotate quickly and smoothly. It will light up an LED bulb mounted on a small generator.2. It has a wide range of applications and is a vivid model showing the basic principles of external combustion engines. Suitable for children's science projects, physics mechanics learning, etc., to enlighten them to explore more scientific knowledge.3. This engine is also a well designed and well made mechanical toy, suitable for people of all ages and all walks of life. For your loved one, this is definitely a wonderful gift.4. This is a fully functional engine used as a teaching tool to demonstrate how to convert energy (heat) into mechanical work. The shaft joint is connected by ultraprecise miniature bearings, which has good stability and does not require lubrication.5. It has a visual texture and beautiful appearance, a stable structure and an exquisite body. There is a soft rubber pad at the bottom for convenient desktop placement. Not only can be used as teaching aids, decorations, but also can be done by yourself.Specification:Item Type: Stirling EngineMaterial: IronLight Bead Color: RGBBulb Color: WhiteProduct Size: Approx. 16x8.8x12.5cm / 6.3x3.5x4.9inWeight: Approx. 734g / 25.9ozApplication: Desktop decorationSuitable for the crowd: Suitable for people over 8 years old, children under 13 years old need adult supervision..Package List:1 x Generator Model2 x White Washer2 x Lamp Beads2 x Blue Hat1 x Iron Sheet2 x Accessories1 x Hex Wrench1 x Black Washer4 x Wick1 x Bulb1 x English ManualNote:1. Please allow 1‑2in 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.