Features: 1. Simple operation: Place on a cup of hot water, preheat for 30 seconds to 1 minute, turn the flywheel clockwise to start, and the engine will automatically rotate. 2. The low-temperature Stirling engine converts thermal energy into mechanical kinetic energy. 3. Through hands-on operation, users can observe the entire engine operation process, gaining a more intuitive understanding of the working principle of the low-temperature Stirling engine and enhancing interest in physics. 4. This product requires minimal maintenance, operates efficiently, and runs quietly. 5. The product comes fully assembled and is ready to use. Specifications: - Condition: New - Item Type: Stirling Engine - Material: Metal - Color: As shown in picture Package List: 1 x Low Temperature Stirling Engine Note: Please note that either the new or old version of this product may be shipped randomly. Ensure you are comfortable with this before placing your order.