mini ite invisible ear hearing aid for portable Product Feature 1. Using low noise microphone, balanced armature loudspealerand high sound gain integrated amplifier chip to make a clear sound quality. 2. Touch-tone hearing aid, comfortable touching feeling and easy operation. 3. Built-in rechargeable hearing aid li-battery for reuse. 4. Beautiful design, small size and portable. 5. MCU control, charging protection. 6. Multifunctional key, not only used as power switch, but as a volume...