Best Digital Tone Hearing Aids Aid Behind The Ear Sound Amplifier Adjustable

Quantity:1 pc
Color: as picture show
Specification
Max sound output: 130+/- 5dB
Sound gain: ≥ 50dB
Total harmonic wave distortion:≤ 5%
Frequency range: 300 - 4000 Hz
Input noise: ≤ 30dB
Voltage: d.c 1.5V
Current: ≤ 4mA
Battery Type: AG13 button cell battery (included)
Features:
Super mini size and light weight, not easily to be seen
Adjust volume to the minimum before wearing
Choose an earplug of slightly bigger size to avoid whistler
Increase volume gradually to avoid sudden increase in sound