Function: 1. Simple operation, use the alcohol lamp filled with 95 percent alcohol to heat the piston tube, and the dry combustion air expands to generate power, driving the flywheel to spin rapidly, thereby lighting the lamp. 2. Through hands-on operation, you can observe the whole working process of the Stirling engine, more intuitive understanding of Stirling principles, and deepen your interest in physics. 3. Use thickened quartz glass as cylinder, durable and safe enough for long term use. 4. In addition to the sterling engine, it is equipped with an alcohol lamp, a large 5V 5W bulb, a glass tube for replacing the cylinder and a fan, making it more interesting 5. It has a wide range of uses for children's science projects, physical/mechanical learning, teacher demonstration props, birthday gifts for friends, family, children, etc. Specification: Characteristics: Simple operation, use the alcohol lamp filled with 95 percent alcohol to heat the glass cylinder, after a few seconds of warming up, let the flywheel spin and it will spin quickly and smoothly. It will illuminate a color-changing LED bulb mounted on a small generator. Through hands-on operation, you can observe the whole working process of the Stirling engine, more intuitive understanding of Stirling principles, and deepen your interest in physics. Selected thickened quartz glass as cylinder, durable and safe enough for long term use. Featuring a powerful 12.5mm cylinder and 15mm stroke piston, this powerful engine will illuminate the colored LEDs on the generator. The generated energy can also be used to power other devices. It has a wide range of uses for children's science projects, physical/mechanical learning, teacher demonstration props, birthday gifts for friends, family, children, etc. Specification: Item Type: Stirling Engine material: stainless steel Speed: 2200-2400 rpm /min Output: about 4V / 100mA LED Color: Multi Color Package List: 1x Stirling engine 1 x bulb (random color) 1 x bottle of alcohol 1 x sponge 1 x small light 1 x eraser (random color) 1 x Tube