Product description
1.Max sound out put:129 +/- 3dB
2.Sound gain:>= 40dB+/- 5dB
3.Total harmonic wave distortion:<= 10%
4.Frequency range:350-4500MHz
Full charging about 2 hours
OK to hearing Amplifiers recharging about 4 times
Working time 50 hours /pc
Total working time 400 hours / 2pcs