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1) Why there are some background noise?
Actually, it is the electric current sound existing in all good machines. Generally, the higher the power, the greater the static sound.
Turning on after put it in ears, then turn up the sound gradually. Generally, You will get used to it after 2-3 weeks.
2) What causes the squeal?
If the ear dome is not inserted well into ear canal or air leaks at the ear dome edges, when the device is close to hand or wall, a certain amount of sound will go back into the microphone. The sound is re-amplified which causes that annoying whistle.
Try and select suitable ear dome. Put the ear dome into the ear canal and make sure it fits snugly inside. Turning on the device after put it in ears.
Specification
1. Saturated sound pressure level: ≤ 115dB + 3dB
2. Average saturated sound pressure: 110dB ± 4dB
3. Maximum gain: 35dB ± 5dB
4. Average gain: 30dB ± 5dB
5. Equivalent input noise level: ≤ 29dB + 3dB
6. Frequency response range: 300Hz ~ 3200hz
7. Total harmonic distortion: ≤ 10%
8. Size: 34.8×15.6×8.3mm/1.4×0.6×0.3inch
Packing List：Hearing aids、Earplug * 3、Cleaning brush、Charging base、English manual
Listening training knowledge.
【Noise reduction function, high quality chip.】With noise reduction processing technology, it can provide the comfort and clarity of listening, and let you get rid of the noise trouble. Imported chip, adapt to a variety of auditory environment, present natural sound quality, more stable sound transmission. The transmission is stable, the true sound is restored, and the eardrum is not damaged.
【USB portable charging, continuous battery life】USB portable charging, charging as soon as you put it. You can charge anywhere at home and office. The blue light is on when charging, and the green light is on when fully charged. It lasts for a long time. It can be used for 20-32 hours at a full charge.
【Clear sound quality and smooth listening】Hearing impaired people cherish sound very much. This hearing aid not only has low power consumption, but also has little distortion. Not only can customers hear, but also can hear clearly and comfortably. This is what we pursue.
【Easy to operate, regardless of the left and right ears】This hearing aid can be worn regardless of left and right ears. It’s easy to operate. It’s easy for the elderly to learn. It also reduces customer concerns.
【Small and light, skin friendly and ear friendly】Novel appearance, small and light, small size, ergonomic design, comfortable to wear, easy to carry. Hidden in the back of the ear, the use of silicone earplugs, skin does not hurt the ear, no burden to wear all day.
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