1. Material: ABS 2. With button battery LR44 3. Battery voltage: DC 1.5V 4. Sound output: 130±5dB 5. Frequency range: 300-4500Hz 6. Harmonic distortion: less than or equal to 10% 7. Input noise: less than or equal to 32dB 8. Size: 5.5x1.6x1cm 9. Weight: 8.8g
