1:Smart Digital Noise Reduction Hearing Aid Using the latest digital chip processor, 16 channels, layered noise reduction, better processing of background noise. Digital hearing aids improve the received sound and clarify it. Restores 100% natural sounds to your ears. 2:Hearing aid function Hearing aids are suitable for people with mild to severe hearing loss, but not for people with total hearing loss. It is suitable for both women and men. It can be used to communicate with family, watch TV, listen to music and enjoy outdoor activities. Allowing you to still hear the beautiful sounds of life clearly in a noisy environment. 3:Bluetooth function, touch design The sound amplifier has Bluetooth functionality. It takes 5 seconds to activate the Bluetooth function when the hearing aid is in status. Please turn off the Bluetooth function and it will take 5 seconds to restore the hearing aid function. You can adjust the volume by touching the outside of the earphones and the message "DU, DU" will sound. 4:Headphone Engineering Design Headphone size: 1.5*2*3cm, weight: 3.6g. The amplifier adopts ergonomic design, is compact and convenient to carry. No need to worry about falling, very stable. 5:Rechargeable hearing aid Portable charging box, use it anytime, anywhere. Simply charge the charging case for about 2.5 hours, it will work for 14 hours and provide 84 hours of backup power for two devices. 6:Easy to operate amplified headphones The switch is fully automatic and easy to operate. Just open the charging box and take out the earbuds to turn on, put them back into the charging box to turn off and charge, the operation is very simple. You may hear a sound when you put it back into the charging case. This is normal and will disappear automatically after a few seconds. 7:Why do hearing aids make a hissing (harsh sound) Because the sound emitted by the receiver of the hearing aid will be picked up by the microphone again, forming a loop, this loop will continue to expand and producing howls. Don't worry, this is normal. 8:Solution to hissing (harsh sound) of hearing aids Choose the right earplugs according to the size of your ear canal and make sure they fit your ears perfectly. Do not hold the hearing aid with your entire palm, use your fingers.