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Prior / SubjectKnowledge - Coggle Diagram

- - - - also deaf can hear
  - - - Mouthpiece?
        
        Hard material (for vibration)
  - - - Using electric signal to make vibration?
        
        Input
        
        AUX code -> Something
        
        How does speaker make sound?
        
        Vibration of a panel
        
        Output
        
        Motor, speaker