Professional Elderly Care Hearing Aid Device Mini Sound Amplifier for Hearing Loss Condition: Item Type: Hearing Aid Material: ABS Power Supply: A312 Battery (Not Included) Function: To compensate the patient's hearing loss. Scope of Application: It is suitable for hearing disorders with conductive, sensorineural and mixed hearing loss due to aging, tympanitis, various diseases caused by medicine, etc. Usage: 1. Replace the earplug parts. Choose the right size and put it in the earplug connector 2. If the button is moved up, it will be louder, and if it is down, it will be turned down. 3. Disassembly: Pinch the earplug with your hand, and separate the tube from the earplug. Precautions: 1. Avoid being swallowed by children. Keep hearing aids and hearing aid batteries away from children. 2. Do not charge the battery or throw the dead battery into the fire to avoid explosion. 3. Do not put the battery together with food or medicine. 4. Do not put the battery in the mouth. If the battery is swallowed, seek doctor attention immediately. Swallowing hearing aid batteries can be life-threatening. 5. Hearing aids can only be used for people with hearing impairment, not for anyone else. Special users: (1) Children cannot wear hearing aids under the guidance of adults (2) Mental patients should consult an internist or professional audiologist before wearing hearing aids 6. Regular inspection: contact your hearing aid expert regularly to replace accessories or inspect equipment according to his or her suggested schedule. 7. Pay attention to moisture. 8. Waterproof: Please don't wear it when swimming. If the hearing aid falls accidentally, don't use a dryer to dry it when it is put into the water. You can wipe it dry with a soft clean cotton cloth and put it in a ventilated environment.