2)It operates because it amplifies sound and you do not have to use a speaker.
4) The wire coming up from the ipod is visible. Also, you can me mechanical components inside the headphones.
5) You can not identify how the sound gets to the headphones from the ipod.
Good job focusing strictly on the inputs and outputs (not the function... although the function is the output...). You could boil your outputs down to simply "sound" though, correct? You could clarify the input as "signal from iPod" rather than simply "iPod".
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