Features: Metal frame ensures stability during operate, designed for repeated use in experiments. Suitable for educators, or science enthusiasts seeking advanced engineering projects. Converts mechanically energy to electricity with visible LED indicators and real-time voltages monitoring via built-in voltmeter. Explore renewable concepts through hands-on assembly, ideal for physics enthusiasts and STEM learners. Includes pre-assembled components for easy building, none additional tools required. Specifications: Component: Metal Size: about 23x13x16cm/9.06x5.12x6.3inch Package Includes: 1pc Engine Model note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.