About this item:
Upgraded chips to enhance human voice and reduce background noise. No whistling sound thanks to the special earbud design.
Hearing amplifiers are rechargeable, which means you don’t need to buy and replace batteries.
Effectively relieves the burden on your ears and provides a comfortable wearing experience.
Put the hearing amplifier in the correct position of the ear before powering on, then press and hold the button for 3 seconds to power on.
suitable for people with air conduction hearing loss of around 30-50 dB. Perfect for listening to music, talking, and watching TV.
Md Mazedul Islam –
You can go directly to Amazon site and see the reviews.
https://www.amazon.ca/Rechargeable-Amplifier-Listening-Assistive-Canceling/product-reviews/B0BV6HMW31/ref=cm_cr_dp_d_show_all_btm?ie=UTF8&reviewerType=all_reviews