Simple in structure, easy to use, simple appearance design, you can use it with confidence. The crank generator is lightweight and reliable, portable and practical, suitable for school use. Through the construction process by themselves, kids can also learn about problem solving and attention to detail. Features -Color: As shown -Material:Plastic, , metal -Size: 8.00X7.50X6.00cm/3.14X2.95X2.36in -Voltage: 0-3V -Current: 0-1A -This hand generator is mainly made of plastic and metal material, which is solid, safe, and not easy to deform. -This hand crank electricity generator could help kids to understand generation of electricity, nice electricity learning toy. -It is easy enough for students and kids to explore in advance and get interested in physics science. -It provides hands on learning experience as well as being one of the safest electricity learning in the classroom. -The crank generator is and interactive experience that keeps kids engaged, nice electricity learning for children. Package list: 1 x hand crank generator