1. Material: plastic 2. Applicable age: over 18 months 3. Eco-friendly material, rounded edges, no burrs 4. Children echo microphone, physical echo, without batteries 5. Microphone lightweight, easy to hold, should not be broken, the baby love to release hands 6. Built-in spring, the use of physics in the acoustic resonance principle to achieve the echo effect 7. Size: about 24 x 8.9 x 5 cm
