Sengdong Hearing Aids Rechargeable Hearing Amplifier for Seniors Adults Behind The Ear Clear Sound,Light-Weight, fit Both Ears
Brand: Sengdong
There will be high pitching sound/whistling if you did not use the hearing instrument correctly, and it's common for all kinds of hearing amplifiers and hearing aid.

To get rid of the whislting, please follow our instructions about the insertion and adjustment:

1.Set the volume at the lowest level.

2.Choose the most comfortable ear dome for your ear. Make sure there is no air go through you ear canal.

3.Wear the hearing amplifier before turning on the device.

4.Adjust the volume and select the mode according to the environment until you can hear clearly.

To conclude: Purchasing a cost-efficient hearing instrument is a good investment and it could be a replacement for hearing instruments with retail prices over 3000 bucks, and all the hearing instruments available in the market are not customized, which means you need to figure out a way to make the hearing instrument fits your ear canal (especially the ear domes) and it will take some time for people's brian and ear(s) to adopt the hearing instruments.

How to charge the hearing amplifier

Just charge 2-3 hours. Please don`t charge it overnight, long-term charging damages battery

Charger adapter is not included. Please use your iPHONE/ANDROID charger adapter for substitute.

About the product size

The size design of our products is based on most ear sizes

so some of customer may think it too large or small

it doesn't matter,our product is 30-day free return

if you don't like this,you can return it

Product parameters:

MAX.SSPL: ≤130dB+3dB

High Frequency Average (OSPL90): 120dB ± 4 dB

Full-on acoustic gain (1600 Hz): 40dB ± 5 dB

Frequency Response Range: 450Hz-3000 Hz

Total Harmonic Distortion: ≤ 10%

Equivalent Input Noise Level: ≤ 32 dB

Rated current:≤10mA

Please contact us if you need any support from us during using our hearing amplifier
Clear sound experience : Sengdong hearing amplifier built in noise reduction chip efficiently reduces noise and amplify the sound surround you, makes you enjoy clear hearing again.
Recycle Charging: This ear amplifier is rechargeable with Micro USB. it is better than changing by battery .
Easy to Use Simple button operation, 1 button to adjust volume, 1 button to switch mode and turn on/off. Easy to operate for seniors.
ERGO DESIGN: BTE(behind the ear) design, it can be switched for left/right ear by rotating the sound tube. Includes different sizes of ear dome(earplug). You can choose the most comfortable one for your ear canal.
AFTER SALE SERVICE AND WARRANTY: We offer customer service and warranty for Sengdong hearing amplifier, contact us if you need any support from us.