This product is manual crank generator, which is made of plastic, and metal material, tough and durable, practical to use. It is excellent for developmental skills and learning minds. It is good . Also, it is a nice experiment and teaching tool. Features -Color: Blue -Material: Plastic, , metal -Size: 13.50X10.00X4.00cm/5.31X3.93X1.57in -No-load output voltage: 6.3V -Output : 0.2A -It can be used as a physics teaching experiment, great to cultivate students and hands-on ability. -Simply turn the handle to be used. The faster you turn the handle, the more power you generate. -This hand crank generator does not need to be installed by itself. It can be easily rotated to easily drive small motors. -Mainly used in the physical experiment of middle school and elementary school. Great instrument for learning physical experiments. -This science tool is perfect for demonstrating the energy transformed from mechanical to electrical. Package list: 1 x hand generator