1,Mini size, Bluetooth earphone appearance, different from old hearing aids, wearing it will not make people notice anything unusual;. The hearing aid mode can be used with two devices; Bluetooth mode only supports single ear mode and does not support pairing with two;.
eBay
The cause of howling/noise: The internal amplifier and the microphone are close to each other of the hearing aid, and the sound is continuously received and extended, so it has a certain possibility of producing howling after power-on.
eBay
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
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
Experience powerful sound amplification in a compact, nearly invisible design! ✅Ideal for Seniors – Simple operation and powerful amplification. Type Hearing Aid. 👂Nearly Invisible Design – Discreet fit with a comfortable beige color.
eBay
Mini Hearing Aids Sound Amplifier Voice Adjustable Portable Inner Ear Aid Care. --Charging 3 Hours,Working 40 Hours 2. One key operation for elderly,Easy to use. 3.Non-inductive design,Comfortable to wear.
eBay
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
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