Purpose: This machine is used to demonstrate the basic structure and working principle of AC and DC generators for junior high school physics and elementary science education. Structure: This instrument is a permanent magnet, rotatable armature generator, composed of a stator, rotor, brushes, base plate, and manual crank mechanism. Demonstration content: Demonstrates the working principle of a single-phase AC generator and a DC generator. Great educational toy that helps cultivate children's interest in physics, making concepts more intuitive and easier to understand. Ideal as a school teaching tool, learning display, or collectible; also a valuable addition to your lab supplies. Color: As shown Material: Metal Package Contents: 1 set Hand crank AC/DC generator Note: Only the items listed above are included. Other products are not included. Note: Light reflection and differences in displays may cause slight variations in color compared to the actual product. Measurement error allowance: 1-3 cm.