1. Material: wood + electronic components
2. Applicable age: 6 years old and above
3. Power supply: 2 x AA batteries (not included)
4. Small and exquisite, easy to carry, both hands and brain, science and technology small production
5. No burrs on the edges, safe and harmless to hands, after fine polishing, children play more at ease
6. Training children practical ability, hand-eye coordination, exercise thinking, development of intelligence, explore science
7. Size: about 9.5 x 7.7 x 7.2cm