The cause of howling/noise: To make a small size hearing aid, the internal amplifier and the microphone are close to each other. The sound is continuously received and extended, so it has a certain possibility of producing howling after power-on.
eBay
CIC Rechargeable Hearing Aid For The Elderly With Noise Reduction Function Digital Display No
Aliexpress UK
Description:Fashion Shape: The device was designed by the most experienced engineers, it's exquisite, small and portable. It even looks like a Bluetooth earphone, it could be worn comfortably. Its shape can fit perfectly in your ear. The big, middle and small earplugs was provided in the package, can adapt to people with different ear canal.Easy Operation: Only one button needs to operation: Long press turn on when device is off; long press to turn off when device is on; Short press add volume when device is on, so easy. No need to replace the battery, you just pull in the standard Mini USB to recharge like mobile when you are not using it. The device will be shut down when you pull it in the box.Noise Cancelling & Great Sound Quality: The device use.
eBay
Rechargeable Hearing Aid Audifonos V30 ITC Invisible Earbuds Adjustable Tone Sound Amplifier In-Ear
Aliexpress UK
eBay
2024 Behind The Ear Hearing Aids for elderly deafness rechargeable amplifier CIC mini digital
Aliexpress UK
Insert the hearing aid into the ear canal and adjust its position in the ear canal until the soft ear tip fully unfolds and fills the ear canal;. If you're not using your hearing aid, turn it off. Hearing aid, non-Bluetooth version (cannot be used as headphones).
eBay
6pcs/lot Hearing Aid Battery Case Fit for A312 A10A675A13 Batteries Storage Box Case Protective
Aliexpress UK
1 x Hearing Aid. we only sales hearing amplifier. Using new technology that can enhance the human voice while eliminating background noise. Lightweight and portable, convenient for the elderly to carry.
eBay
10PCS 1.2V 40mAh Ni-MH Rechargeable Battery With Solder Pins For Timer Toys Watch Hearing Aid Solar
Aliexpress UK
We give 4 different sizes of earplugs to reduce howling and noise. - Suitable for mild to moderate hearing loss (Reference hearing loss map). 1x Hearing Aids. Built-in Battery: Heading Aids - YES; Dock Case - NO.
eBay
Siemens hearing aids
eBay
Personal sound booster. 1pc Hearing Aid. Picks up sounds the human ear wouldn’t normally hear. Great to enhance sound while watching TV or at the movies. It uses new technology that enhances vocals while canceling out background noise.
eBay