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1. Material: ABS 2. Charging case battery capacity: 300mAh 3. Hearing aid battery capacity: 35mAh 4. USB charging, easy to use 5. Light and compact, comfortable to wear 6. One-key operation, simple control 7. External charging compartment, portable 8. Long endurance, small volume and large capacity 9. Clear sound quality, just adjust the volume, that is, can be adjusted to the ideal listening sense
