Tips for hearing aid use:
Use case I:
Does the hearing aid squeak when it's on?
Reason: hearing aid squeaks, which is commonly known as screaming. The main reason is the sound leakage of the contact part between the earplug (eardrum) and the external auditory canal. After amplification by hearing aid
The sound of is leaked through the gap of the ear canal. After being picked up by the microphone of the hearing aid again and amplified again, it will produce whistling.
It's normal for hearing aids to call when they are turned on,
Solution: it is recommended to turn down the volume of the hearing aid before wearing it, and select the appropriate earplugs to plug the ear canal tightly.