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Features: 1. Clear sound, low consumption, small distortion. 2. Rechargeable, built-in high-capacity lithium battery, with super long standby time, eliminates the trouble of buying batteries and replacing the batteries, it's very convenient. 3. Fully charged 1 time can be used continuously for 2 days. Hearing aids for old age/ear hearing machine/BTE hearing aid machine/hearing aid bionic ear sound amplifier * Features: ▪Inner ear type, Auto noise reduction, Super sensitivity, Gain control, Low consumption, Condenser microphone ▪Type: Behind the ear * After switching on the hearing aid, quickly insert it into the ear canal and adjust the position of the hearing amplifier * Use your fingers to dial the volume and adjust it to a level you feel comfortable with * Upgraded chip, more detailed noise reduction than ordinary chip, intelligent noise reduction, no need to debug * Levels of volume adjustment, two mode options Comfortable sound quality for peace of mind