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1. Material: wood + electronic components 2. Power supply: 2 x AA batteries (not included) 3. Safe material, durable and durable, children play more at ease 4. Improve children hands-on ability and exploration spirit, suitable for school and home teaching 5. Combine the toy with scientific principles, make science more simple and interesting, help children learn the principle of gliding airplane 6. Training children practical ability, hand-eye coordination, exercise thinking, develop intelligence, inspire creativity, explore science 7. Size: about 18 x 5cm
