SPECS:

1.Max sound out put:129+/- 3dB

2.Sound gain:>= 40dB+/- 5dB

3.Total harmonic wave distortion:<= 10%

4.Frequency range:450-3400MHz5.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

Note:

Due to different lighting and screen settings, the item color may be slightly different from the picture.