Warning: Never burn the boiler without water The alcohol bottle light makes the brass boiler, which include water inside to be hot, and produce the steam, finally make the flywheel run madly. Features: MODEL:BJ001 Speed:1300 to 1500 RPM Size: 60*55*120MM / 2.36* 2.16* 4.72 in Material: Brass + Stainless Steel Weight:260g / 9.17 oz Packing List: *1 x Steam Boiler *1 x Alcohol Burner *3 x bracket Operation Step: 1.Open the brass boiler, and inject the water to be 2/3 volume, leave another 1/3 volume for the steam. 2. Inject the alcohol to the alcohol bottle light to be 2/3 volume, light the alcohol bottle light, and make the brass boiler hot. 3.After about 2 minutes of heating to the brass boiler, you would see steam coming out from the air outlet, then pull the flywheel and the flywheel will run madly. Don't touch the boiler after you fire the alcohol burner. More you need to read BEFORE you BUY IT: 1.In the beginning of the engine running, some water will be push out by steam from this steam holes. and some water will spray out with steam from the gas outlet in the top of the middle stand base as bellow pictures showed below. You can the water by tissue paper. 2.Please attention, this water leaks out is normal phenomenon, not a quality problem. if you don't accept, please stop here and don't buy it. 100% SATISFACTION GUARANTEE We're so confident that you'll agree our model is the best that we're offering a 30-Day DARE TO COMPARE Money Back Challenge! Be sure you receive an authentic Sunnytech with our logo to ensure 1-year 100% Satisfaction Guarantee. Stirling steam boiler is traditionally classified as an external combustion engine. Please refer to Wikipedia for more information about What is the Stirling steam boiler and How it works?