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Rechargeable Invisible Hearing Aid with Charging Bag and Ear Sound Amplifier$100.99
1. Max sound out put:129+/- 3d - B 2. Sound gain:>= 38d - B+/- 5d - B 3.
Total harmonic wave distortion:<= 10% 4. Frequency range:450-3000MHz 5. Input Noise:<=29d - B +/- 3d - B 6.
Voltage:d.c.3.7V 7. Current:<=10m - A 8. Full charging about 4~6 hours 9.
Normal working about 50 hours 10. Support bluetooth connect SKU: CLB19231