1. Material: wood + plastic + electronic components 2. Power supply: 2 x AA batteries (not included) 3. Safe material, durable and durable, children play more peace of mind 4. Improve children hands-on ability and spirit of exploration, suitable for school and home teaching 5. Combine toys with scientific principles, make science more simple and interesting, let children fall in love with science 6. Training children practical ability, hand-eye coordination, exercise thinking, develop intelligence, inspire creativity, explore science 7. Size: about 10 x 7 x 9cm
