Acquisition Mini invisible CIC Hearing Aid Digital Hearing Aids For The Elder With A10 Battery Free DropShip In The Ear Sound Amplifier-in Ear Care from Beauty & Health on AliExpress discount
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current price: US $29.41
MeloSound CIC Invisible Hearing Aid Portable Small Inner Ear Sound Amplifier high performance digital Hearing Aids
Item Parameters: Working Current: 1.36mA Battery: A10 Harmonic distortion: ≤3% Frequency range: 200Hz - 7645Hz Sound gain: 40dB ± 5 Equivalent input noise: ≤26dB Saturated sound output: 112dB SPL High frequency average gain: 35dB ± 5
About Whistle , its very very normal condition.you can do this 3 steps to remove it . 1 , Choose a suitable earplug to make the product sealed in the ear canal 2 , Low down the sound volume 3 , Put the product into the ear quickly