Feature:1. A Stirling engine is a heat engine that operates by cyclic compression and expansion of air or other gas, the working fluid, at different temperature levels such that there is a net conversion of heat energy to mechanical work.2. The engine is like a steam engine in which all heat of the engine flows in and out through the engine wall.3. Rotation speed up to 3700rpm, great for steam lovers.4. Through hands-on operation, you can observe the entire process of stirling engine5. Ideal for children's science projects, physical/mechanical learning, teacher demonstration props, birthday gifts for friends, family, children, etc.Specification:Condition: Brand NewItem Type: Stirling EngineSpeed: Max. 3700rpmInstructions:1. Toggle flywheel by hand, if not smooth, adjust the screws.2. Check if the sliding parts are clean.3. Fill alcohol lamp less than two-thirds.4. Light alcohol lamp on the front of the test tube, toggle flywheel after about 1 minute, the engine turns. The warm-up time of the generator is slightly longer. Package List:1 x Glass Base1 x Blade1 x Alcohol Bottle1 x Bullet Head1 x Bracket 3 x Screw1 x ScrewdriverNote:1. Do not touch the test tube roasted and the metal connected to it to avoid burns.2. Do not light alcohol lamp for long time, alcohol lamp can not easily touch to avoid burns.3. Suitable for more than 8 years old to use, if less than 8‑year‑old need to under the supervision of parents to operate.4. When heated, the alcohol lamp wick can not touch the test tube, the piston can not refuel, and both ends of the connecting rod need to be lubricated.5.Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.