Mainly depends on the different levels of the chip inside the hearing aid and the configuration of spare parts, but the appearance is almost no difference, the average consumer is difficult to detect. It's not surprising that the performance of different levels of chips can vary by tens of times.
Improper use of hearing aids can cause serious damage to a patient's residual hearing! Hearing aids are not sphygmomanometers and should not be purchased at random from a store. Experienced dispensers, qualified dispensing environments, and professional process control are essential, so patients are advised to seek help from a hearing aid dispenser with a qualified medical device license and long-term professional experience.
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Note:
Recently occurring senile deafness, do not rush to wear hearing aids, a period of time of treatment, if there is no improvement, then consider wearing them, wearing them too soon may aggravate the deafness due to the receipt of strong sound stimulation.
When using a hearing aid, it is important to go through a thorough examination by an expert and choose a type of hearing aid according to each person's different situation.
In age-related deafness, the degree of deafness in both ears is often inconsistent. Wear it on the side with poor hearing so that the other ear can still hear the sounds of nature, thus achieving harmony of hearing in both ears.
If you are moderately deaf in one ear and severely deaf in the other, you should wear it on the side with good hearing to get the best results.
Baidu Encyclopedia - Hearing Aids