Causes of whistling/noise: In order to make a small hearing aid, the internal amplifier and microphone are placed close to each other. The sound is continuously received and expanded, so there is a certain possibility of whistling after power-on.
eBay
Rechargeable Elderly Hearing Aid 5 Levels Sound Adjustment Wireless Sound Amplifier The Listening
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). Saves your trouble to buy button batteries frequently. Wear: Left / Right ear both are OK.
eBay
2024 New Mini in-Ear 16-Channel Rechargeable Digital Hearing AIDS, Hearing AIDS For the Elderly and
Aliexpress UK
Input Noise:<=32dB. Max sound out put:118+/- 3dB. Sound gain:>= 35dB+/- 5dB. Main unit, Charging 2~3 hours for 20 hours use.
eBay
Rechargeable Digital Hearing Aid Adjustable Tone Best Sound Amplifier Portable Deaf Elderly BTE
Aliexpress UK
Neckband Hearing Amplifier. Comfortable & Neckband. 1 Hearing aids. It maybe the most comfortable to wear and longest-lasting hearing amplifier you can buy. Everything you need to get better hearing.
eBay
Pair of Rechargeable Noise Cancelling Hearing Aids for Seniors - Over-the-Counter Hearing Aids with
Aliexpress UK
● Digital sound amplifier: Advanced digital signal processing technology provides a high quality of natural sound, detects and identifies sound waves and changes the amplification of the channel in which the noise is located to make normal speed clearer.
eBay
CIC Rechargeable Noise Reduction Hearing Aid for the Elderly Magnetic LCD Display No Howling Hearing
Aliexpress UK
Features:-There are five levels of volume control with beep prompts.-Equipped with portable charging case, 3-4 hours to full power of the case, can offer totally 36-90 hours of use. -The operation is simple, long press to turn on and short press to adjust the volume, making it convenient for the elderly to use.-High-definition sound quality enables barrier-free communication, and the full-scale gain is greater than 35dB.-The cochlear ergonomic design is comfortable to wear and can be used for a long time.Specification:Material: ABS+siliconeMAX OSPL90 (dB SPL): ≤115dB+3dBHFA OSPL90 (dB SPL): 110dB±4dBFOG：30dB±3dBHFA FOG：29dB±3dBFrequency range: F1<400Hz, F2>4700HzTHD 500Hz：≤5+3%THD 800Hz: ≤5+3%THD 1600Hz: ≤5+.
eBay
Rechargeable USB Digital Hearing Aid Behind the Ear Sound Amplifier Elderly Noise Cancelling Deaf
Aliexpress UK
About this item .
eBay
Rechargeable USB Digital Hearing Aid Behind the Ear Sound Amplifier Elderly Noise Cancelling Deaf
Aliexpress UK
2 x Hearing Aids. It takes about 2 hours to finish charging and you can use it for about 20 hours. 【EASY TO USE】-Blue device for left ear, red device for right ear, white charging case. Obvious On/Off button for easy operation.
eBay
Bluetooth Hearing Aids for Seniors Rechargeable with Noice Cancelling Phone Control RIC Dual
Aliexpress UK