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1. Sound output (MAX): 129+/-4 dB 2. Sound Gain (MAX): 50dB +/- 5dB 3. Harmonic distortion: less than or equal to 5% 4. Frequency range: 450~3500hz 5. Input noise: less than or equal to 30 dB 6. Battery: Lithium battery 7. Working voltage: DC 3.7V 8. Working current: less than or equal to 3mA 9. Dimensions: 6.6 x 1.3 x 1.3cm 10. Net weight: 26g 11. Please do not use the computer to charge. 12. Please do not charge more than 6 hours
