Fine Sound Quality Comfortable Listening -- Intelligent noise reduction processing, low frequency noise reduction, clear Sound, intelligent environment sound processing, Little Distortion,Low noise. Volume adjustment(Adjust the appropriate volume as needed),suitable for different hearing ranges. Long battery life and operation easily -- Two battery options(AG13/LR44), it is convenient and quick. It can continuous use a week if you use it 3 hours a day. One-button switch and volume adjustment, easy to use for the elderly. Comfortable to wear -- Ergonomic Design, it is not easy to fall off. its fit to wear and more comfortable. Sound tube is made of silicone, durable and comfortable to adjust, it can be roated 180 degrees left to right. You can wear it at will regardless of the left and right ears, and it will not be affected by wearing glasses. Lightweight and and easy to carry -- Hearing aids for adults is small and light-weight,only about 7g, different sizes of earbuds are suitable for everyone. wireless ear hook and compact body, easy to carry around, smoother communication. We advices -- Please regularly clean the ear plugs or ear molds in order to ensure the normal use of hearing aids. Please remove the batteries to prevent battery rot erosion hearing aid components if you not use it for long periods of time. How to Use:Step 1: Choose earplugs according to the size of your ear canal. Step 2: Open the battery compartment and put in the AG13 battery. Step 3: Turn off the battery compartment, turn on the power button and adjust the volume. Step 4: Wear a hearing aid and start it. Ways to avoid howling/noise:When the power is high (the amplified sound is large), howling is more likely to occur. Therefore, gradually increasing the volume from low can effectively avoid howling. When the ear canal is completely sealed, there is no howling sound. Therefore, please use hearing aids after cleaning your ear canal, and test the earplugs from large to small to find the most suitable earplugs. After the hearing aid enters the ear canal, it is recommended to push the hearing aid with your fingers and hold it for 1-2 seconds, and then release it to fully extend the earplug. Product Size: 6.8*4.4*1.9cm Hearing Aids For Seniors Adults,sound Amplifier