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Product Details:
Type: Rechargeable hearing aid
Feature : Analogue, Rechargeable, Bluetooth Type
Color: Black
Weight: 9.5g
Size: 4.35*2*1.3cm
Battery: Lithium battery, its capacity is 70mAh

Specifications:
Max Sound Output: ≥127dB ± 4dB
Max Sound Gain: 48dB ± 5dB
Total Harmonic Distortion: ≤5%
Frequency Range: 450~3500 hz
Equiv Input Noise: ≤30 dB
Battery: Lithium Battery
Working Voltage DC 3.7V
Working Current: ≤4mA
Measurement: 4.35*2*1.3cm

Detailed Product Description:
Rechargeable, work for about 20hours after fully charged
Bluetooth type, invisible, nobody knows it's a hea