Mini Stirling Engine, Physics Model, Safe Sturdy Simple Operation Durable for Mechanical Learning Physical/ Specification: Features: Simple operation, use 95% alcohol filled alcohol lamp to heat the glass cylinder, after a few seconds of warming up, let the flywheel rotate and it will spin quickly and smoothly. It will illuminate the color-changing LED bulb mounted on the small generator. Through hands-on operation, you can observe the entire process of Stirling engine operation, more intuitive understanding of Stirling principles, and deepen your interest in physics. Selected thickened quartz glass as the cylinder, durable and safe enough for long-term use. Euipped ith a 12.5mm high power cylinder and a 15mm stroke power piston, this powerful engine will illuminate the colored LEDs on the generator. The generated power can also be used to power other devices. It has a wide range of applications for children science projects, physical/mechanical learning, teacher demonstration props, birthday gifts for friends, family, children, etc. Specification: Condition: Brand New Item Type: Stirling Engine Material: Stainless Steel Speed: 2200-2400rpm Output: About 4V / 100mA LED Color: Multi-color Package List: 1 x Stirling Engine 1 x Light Bulb (Random Color) 1 x Alcohol Bottle 1 x Sponge 1 x Small Light 1 x Rubber Band (Random Color) 1 x Tube