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
6PCS/LOT( 1 PACK) Zinc-air battery E675 A675 P675 675 PR44 for Hearing aid best quality
Aliexpress UK
We give 4 different sizes of earplugs to reduce howling and noise. Feature 1. Peak Gain(dB): 35dB, suitable for mild to moderate hearing loss (Reference hearing loss chart). Insert the hearing aid into the ear canal, adjust its position in the ear canal until the soft earplug is fully deployed and fill the ear canal.
eBay
6-60PCS Hearing Aid Batteries RAYOVAC PEAK 1.45V 312 312A A312 PR41 Zinc Air Battery For BTE CIC RIC
Aliexpress UK
Feature - Comfortable: Made of high-quality material, durable and sturdy, comfortable to wear. Ergonomic design, soft and flexible, these hearing aids help you a lot in daily life. 1 x Hearing Aids.
eBay
Unisex Bluetooth Hearing Aid Device Wireless Remote Control Invisible Earbuds for Elderly People
Aliexpress UK
Input Noise:≤32dB. We will respond to you within 24 hours and do our best to help you out! Max sound output:118±4dB. Sound gain: ≥32dB±2dB.
eBay
6-60PCS Hearing Aid Batteries RAYOVAC PEAK 1.45V 312 312A A312 PR41 Zinc Air Battery For BTE CIC RIC
Aliexpress UK
Choose:Upgraded version(1 pair) About This Item: -Specially designed for hearing-impaired people, more suitable for the ear canal. Even when used for a long time, there is no pain. -Your hearing aids can be charged using the detachable charging case (you will need to charge the charging case first). -Maximum gain is 117dB, suitable for moderate to severe hearing loss (see hearing loss table). -If the earmuffs are not fully inserted into the ear canal, or if the air leaks out of the earmuffs, it will cause an annoying whistling sound. We offer 3 different sizes of ear tips to reduce whistling and noise. -Super-mini size and light weight for easy carrying. .
eBay
10pcs LIR 7854 LIR7854 Steel Shell 3.6V Headset Battery For Hearing Aid Apecial True TWS Bluetooth
Aliexpress UK
Hearing aids can effectively reduce noise and amplify sound. Our accessories include earplugs of different sizes. This small device allows you to wear comfortably and provide a clear sound. 1 Hearing Amplifier.
eBay
6-60PCS Hearing Aid Batteries Rayovac PEAK 1.45V High Performance 312 312A A312 PR41. Battery For
Aliexpress UK
Hearing aids can effectively reduce noise and amplify sound. Our accessories include earplugs of different sizes. This small device allows you to wear comfortably and provide a clear sound. 1 Hearing Amplifier.
eBay
6pcs/lot Hearing Aid Battery Case Fit for A312 A10A675A13 Batteries Storage Box Case Protective
Aliexpress UK
Insert the hearing aid into the ear canal,adjust its position in the ear canal until the soft eartip is fully deployed and fill the ear canal. Clean the ear canal before use. Comfortable: Made of high-quality material, durable and sturdy, comfortable to wear.
eBay