ENGINEKITOR Cross Twin Stirling Engine Generator Kit with Voltmeter & LED - Build Your Own EngineENGINEKITOR Cross Twin Stirling Engine Generator Kit with Voltmeter & LED Build Your Own Engine Cross Stirling Engine Converts mechanical energy into electrical energy with efficient operation. Power Generation Device Enhances voltage and current output for better performance. LED Light Provides a clear visual indicator of power output. Voltmeter Allows for accurate measurement and monitoring of generated power. Specifications: Material: Metal Package