Mini Smart Noise-Canceling In-Ear Hearing Aids - Rechargeable Sound Amplifiers for Seniors
1.Max sound out put:118+/- 4dB
2.Sound gain:≥ 32dB+/- 5dB
3.Total harmonic wave distortion:≤ 5%
4.Frequency range:300-3800MHz
5.Input Noise:≤30dB
6.Voltage:d.c.1.4V
7.Current:≤1.5mA
8. Full charging with 2 hours
9. Working about 35 hours
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