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Product parameters:
1. Max sound out put:129+/- 3dB
2. Sound gain:>= 40dB+/- 5dB
3. Total harmonic wave distortion:<= 10%
4. Frequency range:450-3400MHz
5. Input Noise:<=32dB
6. Voltage:d.c.1.2V
7. Current:<=1.2mA
8. Full charging about 2~3 hours
9. Working more than 40 hours
Packing list:
Main Unit x1
Earplugs x6
Brush x1
User Maual x1
USB Charging cable x1
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