1. Material: ABS
2. Built-in lithium battery 30mAh
3. Charging time: about 2 hours
4. Working voltage: d.c.3.7V
5. Working time: about 35 hours
6. Frequency range: 450-3400MHz
7. Input noise: less than or equal to 32dB
8. Working current: less than or equal to 1.2mA
9. Total harmonic distortion: less than or equal to 10%
10. Sound output: less than or equal to 129 ±3dB
11. Sound gain: greater than or equal to 40dB ±5dB
12. Net weight: 6.5g
