Feature: 1. Come with clear sound quality, low power consumption, low distortion, natural original sound 2. All sounds can be heard clearly whether you are at home or on a noisy street, very practical 3. Ergonomic designed body, compact and beautiful, and wear without weight 4. The earplugs adopt food‑grade silicone, which is easy to remove and wear, skin‑friendly and environmentally friendly, and does not hurt the ears 5. Sound reduction and noise reduction function can reduce the interference caused by howling noise, protect hearing, and increase listening comfort and clarity Specification: Item Type: Hearing Aid Material: ABS+silicone Power Supply: 1 x LR44H battery (not include) Instructions: 1. Open the box cover and place the battery in the correct direction. Zinc-air battery is the best choice with long life, please make sure the battery box is closed before use. 2. Put the ear hook on your ear and plug the earplugs tightly. (Note: The unit is in the on-off position. The volume is adjusted to 1. Otherwise, the instant sound will make you uncomfortable). 3. Turn on the power and adjust the volume to get a clear sound. 4. If you hear a whistle, please check whether the earplugs are plugged tightly. If it can’t be inserted tightly, please replace the earplugs of other sizes. Package List: 1 x Hearing Aid2 x Earplugs1 x User Manual1 x Storage Box Note: 1. It is forbidden to use for patients with otitis media or ear abscess.2. Do not use at high volume for a long time. Otherwise it will hurt your ears. If you feel unwell, stop using it.3. Please take care of the product at any time to prevent the earplugs and the radio hole from being blocked by foreign objects. This will affect the effect of the amplifier.4. Avoid electric shock and dropping the product. Do not store or use in a humid, high temperature environment5. Don't throw away waste batteries. General garbage should be handled with special equipment.6. If you do not use it for a long time, please remove the battery. Otherwise, the parts will be corroded by the rotten liquid in the battery.7. Do not use this product in an explosive and dangerous environment.8. Don't leave this thing to children. It will hurt him or others, or damage the unit.