Rechargeable Hearing Aid Intelligent Noise Reduction Long-Lasting Sound Collector-1PCS

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:<=28 dB+/- 3dB 6.Voltage:d.c.1.2V 7.Current:<=1mA 8. Full charging with about 2 hours 9. Working about 40 hours Maximal Sound Output:129dB ±3dB Input of Adapter: 100-300V Alternating Current 50/60HZ 0.15A Note: To protect your hearing, please don't use this product at a high volume for a long time. Not suitable for the crowd 1.According to the average frequency of pure tone audiogram language frequency calculation, or in the 0-30dbwithout the use of hearing aids 2.Sudden deafness,especially occurring within three months 3. Tinnitus, unilateral or bilateral 4.Rapidly progressive hearing loss 5.Obscure aural crowds with unexplained hearing 6. Serious binaural otitis externa, otitis media, pus,and double external auditory canal closure. The actual color and shape of the item might looks slightly different from pictures because of the technical improvement and manufacturing variance or Computer screen color difference.