What is a "green engine" ?
I have never heard of that before, have never seen anything like it.
What is it supposed to do?
I am so glad nobody else could figure that out. Have you been screaming at him? Maybe he is just giving you the silent treatment.
Where is his microphone? Can you find that and test it out? EDIT: Is that his microphone that your showing in the picture? The one that looks crudded up? Can you remove that and replace it? Or is that the speaker - if so, same question.