How to use:1. Turn the flywheel by hand to see if it is , and if it is not , adjust the relevant screws (it has been adjusted before selling). 2. check whether the sliding parts are clean. 3. Fill the alcohol lamp to less than two-thirds. It should be noted that the best effect is to use alcohol with a purity of 95%. 4. Light the alcohol lamp and place it at the front of the test tube. After about 1 minute, turn the flywheel, and the engine rotates. The warm-up time with the generator is slightly . Matters needing attention 1. Do not touch the baked test tube and the metal connected to it to avoid . 2. Light the alcohol lamp for a long time, and the alcohol lamp should not be touched easily to avoid . 3. It is suitable for children over 8 years old and adults, and those under 8 years old need to be accompanied by adults. 4. Do not touch the cotton thread to the heating cylinder (test tube) when heating alcohol. 5. Both ends of the side rod need to be lubricated, but the piston cannot be lubricated. Colour:Silver Material:Metal Package Contents: 1 x Stirling Balanced Engine Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.