MIMITAKARA Active Good Hearing A1 System provides 4 different operation modes (General Mode, Noisy Mode, Car and Dialogue Modes) so that user can select in different environments. It also provides individual volume adjustment in 10 levels for user to choose the right volume for left/right ear. When A1 is connected to Smarphone via bluetooth, user can do self-fitting via proprietory application for customized setting. Also, the system would become an Audio Visual device for multimedia, or acting as receiver for phone calls. Howling control prevents high frequency feedback from pick up to speaker, and Automatic Gain/Noise control provides immediately protection of ear when sudden high noise impact is detected.